Unfortunately I won't be there and can't help. However,I'm not sure when you were there or for that matter what the rules are in Nevada.
In Atlantic City there is also a time period where TITO tickets are valid in a machine for use or redemption but they can still be redeemed at the cage once the time period expires. I believe it is at least a year. It might be prudent to find out as it may not be that much of a rush as you think.