For a web page article

http://casinogambling.about.com/od/slots/a/Redeem.htm

"Casino Policies
At Foxwoods in Connecticut the ticket/vouchers from the slot machines are good for 240 days. If you forget to cash one in you can mail it in to collect your money.

Harrah’s is one of the biggest national gaming companies and I called several of their casinos to check their polices. When I called the casino in Atlantic City I was told that the EZ Pay vouchers did not expire but if I wanted to redeem one after 90 days I would have to go to the main cage to cash it. At Harrah’s in Las Vegas the vouchers are good for 90 days and they even have an address printed on the back with instructions for mailing in the voucher.

Boyd Gaming is another national company and their policies differ at casinos around the country. At Sam’s Town in Tunica, MS the slot vouchers are good for 60 days and if you forget to redeem one, you can mail it in to collect your money. This is not the case at the Fremont, another Boyd property in downtown Las Vegas. I was told that the slot vouchers at the Fremont expire in 30 days and there is no way to mail them in or redeem them other than in person.

When I called the Mirage in Las Vegas I was told that their vouchers were good for 90 days but there was no way to mail them in. A player must cash it or lose it."