This is the response I got to my email to the seller:

Hello, Yes i got the chips in Las Vegas at the Horseshoe, I was playing on the
craps table and the dealers told me that the chips were old and soon to be obsolete.
And that the Horseshoe casino will soon stop using .25 cent chips. So i collect A
few for mysef and selling some on ebay!! Thanks!! Wardell

Well if a dealer says so it must be true.
BriaN