If a seller shipped you two of something you only ordered one of, you generally do have to return the duplicate shipment when the seller asks for it back and provides free return shipping. If the seller never contacts you about the extra item, your practical risk in keeping it is close to zero. The middle ground, where a seller wants the product returned but expects you to pay shipping, is one you can push back on.
Why a Duplicate Isn’t the Same as an Unordered Package
You may have heard that federal law lets you keep merchandise you never ordered as a free gift. That rule comes from 39 U.S.C. § 3009, which treats sending unrequested products and then demanding payment as an unfair trade practice.1Office of the Law Revision Counsel. 39 U.S. Code 3009 – Mailing of Unordered Merchandise The FTC puts it simply: “you never have to pay for things you get but didn’t order.”2Federal Trade Commission. What To Do if Youre Billed for Things You Never Got, or You Get Unordered Products
A duplicate is a harder case. The statute covers merchandise “mailed without the prior expressed request or consent of the recipient.”1Office of the Law Revision Counsel. 39 U.S. Code 3009 – Mailing of Unordered Merchandise You could argue a second unit fits, since you asked for one. You could also argue it doesn’t, because you have a real transaction with the seller and the extra item is an honest fulfillment error, not a scheme to bill you. The FTC has never issued guidance resolving this, and no federal court decision draws a clean line.
What fills the gap is the common-law doctrine of unjust enrichment: someone shouldn’t profit from another person’s honest mistake when the mistake is easy to fix. That’s the legal principle that lets a seller ask for a mistakenly shipped item back, even though you did nothing wrong to receive it. The practical result is that keeping quiet about a duplicate rarely creates trouble, but refusing a reasonable return request can.
What to Do When the Extra Package Arrives
Check your order confirmation and your card or bank statement first. Confirm you ordered one and were only charged for one. If you were charged twice, that’s a separate billing problem, addressed further down.
Leave the duplicate unopened and set it aside somewhere safe. As long as it sits untouched in the condition it arrived, you have the most flexibility no matter what happens next. Once you open, use, or damage it, your position weakens if the seller later asks for it back. You’re not expected to go to extraordinary lengths to protect it, but don’t leave it out in the rain or treat it carelessly.
Email the seller so you have a written record. Keep the message short: you ordered one, received two, and want to know how they’d like to handle it. Companies deal with this constantly. For low-cost items, many sellers will tell you to keep it because return shipping would cost more than the product. For higher-value items, expect them to want it back.
Who Pays to Ship It Back
No federal statute spells out who pays return shipping on a duplicate. The practical answer is the seller: they created the error, and no sensible reading of the law asks you to spend your money fixing it. In almost every case, a seller who wants a duplicate returned will send a prepaid label, arrange a carrier pickup, or simply tell you to keep the item.
The FTC’s Mail Order Rule requires sellers to provide the means “at the seller’s expense” for consumers to exercise their rights when order problems come up.3eCFR. 16 CFR 435.2 – Mail, Internet, or Telephone Order Sales That specific provision targets shipping delays rather than duplicates, but the principle is the same: fulfillment failures are the seller’s cost, not yours.
If a seller asks you to return the item at your own expense, decline in writing and offer to send it back as soon as they provide a prepaid label. Document the exchange. That leaves you in a strong position both legally and practically.
What Can Happen If You Keep It Anyway
For most duplicate shipments, the answer is nothing. Sellers write these off as a cost of business, especially on inexpensive products. The risk changes with the value of the item and with whether the seller has contacted you.
Civil Claims
A seller can bring an unjust enrichment claim in civil court. The argument is that you received something you didn’t pay for, the seller lost the value of it, and fairness requires returning it. Courts look at how long you kept the item, whether you acted in good faith, and whether returning it is practical. Nobody sues over a $30 kitchen gadget. A $2,000 laptop is another story.
A related theory is conversion, which means exercising control over someone else’s property in a way that seriously interferes with their ownership. If a seller asks for a valuable duplicate back, provides a prepaid label, and you refuse, a court could treat your continued possession as conversion and hold you liable for the item’s full value.
Criminal Exposure
Most states have statutes that criminalize keeping property you know was delivered by mistake. The usual elements are that you knew the item arrived by error, intended to keep it permanently, and failed to take reasonable steps to return it. Because intent is part of the crime, honest confusion or procrastination isn’t enough for a conviction. But once a seller has formally asked for the item and offered a free return, ignoring them starts to look intentional.
Prosecution over a duplicate shipment is extremely rare. Law enforcement has bigger priorities. Still, on an expensive item, a seller who files a police report creates a paper trail that can complicate your life even if charges never come.
If the Seller Charges You Instead of Asking for a Return
Some sellers skip the return request and just charge your card for the second shipment. That’s improper. You didn’t authorize a second purchase, and the Fair Credit Billing Act gives you the right to dispute it. The law’s definition of a “billing error” covers charges for goods not delivered in accordance with the agreement made at the time of the transaction.4Office of the Law Revision Counsel. 15 U.S. Code 1666 – Correction of Billing Errors You agreed to buy one. A charge for a second one fits.
Send a written dispute to your credit card issuer within 60 days of the statement showing the charge. Address it to the issuer’s billing inquiry address, not the regular payment address. Include your name, account number, the date and amount of the charge, and a short explanation that you were billed for a duplicate you never ordered.4Office of the Law Revision Counsel. 15 U.S. Code 1666 – Correction of Billing Errors Send it by certified mail and keep copies. Once the issuer has your dispute, it can’t try to collect the disputed amount or report it as delinquent while the investigation is running.
Telling a Real Duplicate From a Scam
Not every unexpected package is a fulfillment error. Two situations look similar at first but sit on the other side of the line, where the unordered merchandise rule protects you fully:
- Brushing scams. A third-party seller ships cheap items to your address in your name, then posts fake “verified purchase” reviews under your identity. These items are genuinely unordered under § 3009, so you can keep or discard them. Change your passwords and watch your accounts, because someone got hold of your information.
- Negative-option billing. You sign up for a free trial or one-time purchase, and the company starts shipping and charging every month. Without your express informed consent to recurring shipments, those shipments are unordered merchandise, and you owe nothing.5Federal Trade Commission. Business Guide to the FTCs Mail, Internet, or Telephone Order Merchandise Rule
The dividing line is whether you have a legitimate order with the seller. A second copy of exactly what you bought from a company you actually shop with is a fulfillment error, and the gray area described above applies. An unexpected package from a company you’ve never done business with is unordered merchandise, and § 3009 protects you without ambiguity.1Office of the Law Revision Counsel. 39 U.S. Code 3009 – Mailing of Unordered Merchandise