I have noticed that some Casinos have posted dates that will end the acceptance of certain chips. Another method I noticed was some chips a friend brought back from a Cruise Ship. Carnival's 1996 MS Inspiration has "Valid Until April of '97" printed on the chip. I have heard referrences to others with the ending date on the rim of the chip. Who was the first one to utilize this practice? Wonder what happens to all the ones left over after the expiration date?