They look like a Chipco International product. Perhaps made for the Caribe Hilton but kept in the vault as being "defective" (no Puerto Rico on them) - potentially a backup set. Hotel casino about to close, somebody remembered the chips, perhaps in an effort to validate their production (for tax write-off purposes), the hotel quickly set some out on the tables. Now they were "played with" (briefly). The only suspicious question is, where have they been hiding all these years? And why the high price tag on them, since a hoard of them has now been revealed?

That place is weird - 54 varieties of $1 chips? (55, if you count the new discovery as genuine.)

"Decide for yourselves and don't pay too much for a 25¢ lizzz . . . )