I have picked up the freeplay tokens in the scan and am not really sure what they are. But as I don't collect these, they are all available as trade, although I'd love some information about them.

Silverbird - reverse says Free Play Token.
Sundowner Hotel Casino 1975 Free Slot Play NVC, Reno.
Club Cal-Neva Premium Token, Lake Tahoe
Honest John's Casino. One side says 5 free lucky jackpot nickels, and the reverse saysgood for one free cocktail.
Grest hotel & mini-casino, 207 N.St Las Vegas Premium Token

Jason