They were a limited edition, and some chips say so, and use a number on each chip…so they’re not lot numbers but consecutively-numbered limited chips.
My guess is these are limited to 1,000 or 1,500, 2,500 etc. but usually the chips say how many there are in the series, these do not.
As far as the number, collectors (of most collectibles) tend to value the very lowest numbers more than others.