I have no connection to this auction other than just seeing it at the Heritage Auction site. I don't see the chips at the Spragg "Preserving Gaming History" mold distributors orders page. Auction says:
https://historical.ha.com/itm/political/john-f-kennedy-large-gaming-chip-set/a/6168-43394.s?ic4=ListView-ShortDescription-071515

"John F. Kennedy: Large Gaming Chip Set. Extensive collection of 1.5" plastic gaming chips, each with a white insert stamped in gold "JFK". The chips are housed in five wooden trays in a 19" x 8" x 3" leather-covered attaché-style case. Each chip has an alternating diamond & rectangle mold around the perimeter. There are 196 blue chips, 85 beige chips, 93 black chips and 96 teal chips. According to documentation provided by the consignor, the chips were donated to a Dania, Florida thrift store by personnel of the JFK Compound in Palm Beach. They were then purchased by a local estate liquidation service who sold them to the current consignor."

Robert