Yeah I seen them before when they were at the high buy it now price. The corner of one pic shows the face of a white chip, and you see they are the square hat only mold, complete with injection pip inside the hat.
I have "sands" set very similar. Nice box. Hat no cane plastic chip but to be honest not a bad plastic chip. Feels pretty nice, stacks well and sounds good splashed. Very playable chip but not a Paulson
They are a better than average plastic chip... Heavy and flat. The ones I acquired when I was buying a storage box show some discoloration but my grandson can stack them pretty high... I prefer that he play with them rather than the Paulsons so I leave them in his very own "spinning" chip holder. We have used them on family night "I bet two blue ones" poker.
I bought a set like that, chips are plastic. I bought it for the Riviera case. Got it pretty cheap too. I put in the 5 dollar bid. Sad to see prices go so high, but I would have bid higher on this one back in the day, before I got it. If you want to build a Riviera set, this is the case to get, but it won't hold a lot of chips.