Found there are two variations of the New Prospectors Club Membership Card previously listed under Sam's Town Gold River. The original blue card had an expiration date of 6-30-98 while there is a similar grey card that is almost identical except it has a 12-31-89 expiration date. These cards were folded in half to make them the size of a business card.

Also found recently were three new paper cards from this same casino...

A white Roxy's Royal Flus Club, a parchment Golden Gulch Player card and a white 1989 Dollar Slot Club Member card.

Scans of all the newly found paper items have been added on the ChipGuide.
http://themogh.org/cgupdate/cg_chip2.php?id=NVLAGO&p=0001000#320