Conceivably.
I wonder how many different manufacturers made the interlocking-type poker chips. I haven't looked into it deeply. My gut reaction is that USPCC and Burt Co probably did not, but I only say that because of the direction their product mix took later on as they catered to the cardroom, club, and casino customers. They did make embossed chips (or at least USPCC did), and the interlocking chips could have been manufactured the same way - the commonly-found "boston terrier interlocking chips" are certainly embossed.
Drueke started with wood products (chess pieces, mainly, but maybe also including wood poker chips?) and then later made products out of Tenite, a brand of cellulose acetate, which is a plastic similar to celluloid but with a different chemistry and a greatly reduced tendency to catch on fire and explode. So maybe some of those poker chips are Tenite instead of shellac/clay composition?