What happens if you lose a winning lottery ticket?

A lottery ticket works like cash: it is a bearer instrument, and in most states whoever walks in holding an unsigned winner can claim it. Losing one is losing the money, unless a couple of things went right beforehand.

The thing that changes everything is the signature. Sign the back and the ticket stops being anonymous, because the lottery matches the signature and identification of whoever claims against the name on the ticket. A found, signed ticket is very hard for a stranger to cash, while a found, unsigned one is theirs in practice, whatever the ethics of it.

If a ticket goes missing, call the state lottery straight away with the details: the store, the date and time, the game and ticket number if you have it, and photos if you took any. Retail terminals log every sale and every validation, so the lottery can see when and where a ticket was sold, and some states will flag a reported prize while they look into a dispute. Also there usually are audits where the state lotteries will ask stores for camera footage so they can review who made the purchase of the lottery ticket. That trail is how stolen-ticket cases keep ending in arrests, and it works the same way for lost ones.

So if you lost the ticket physically and can't find it and no one cashes it before the deadline, there's basically nothing you can do. Routine matters more than any recovery process: sign it the moment it wins, photograph the front and back, and put it somewhere a glovebox is not. A damaged ticket can often still be validated, and an old one may still be good inside the claim window. A lost, unsigned one cannot.