If I use my card to redeem my my rewards play, if I forget to take it with me, will somebody else be able to redeem the money

No. Pin numbers safeguard it.

No the have pin numbers

If you leave it in machine and cash out..no.

No, just get another card at the rewards desk

No

no u can get another rewards card

Only if they know your pin or playing with the money on that machine. Its like a tyme card