Here's a $5 Black Orchid chip. This series has had unusual sales activity over the years, on occasion, so I had it on my watchlist, just out of curiosity. Not my sale, and I'm not a bidder at all, just watching.
https://www.ebay.com/itm/Rare-Obsolete-Discontinued-Black-Orchid-5-Dollar-Casino-Chip-1960-039-s-Yellow-/264764427236?_trksid=p2047675.l2557&nma=true&si=XEvySFrUYUQ%252B%252Be1xtq6cT3yO4Qk%253D&orig_cvip=true&nordt=true&rt=nc

The chip was listed previously at $99.99, got 1 bid which was later retracted, and ended as unsold. The seller resisted it, and the result was a final sale value of $255.55. Multiple bidders this time, but the top action was between 2 buyers -- a "0" feedback buyer, plus an experienced underbidder (5193 feedbacks) going back and forth. Check the "Bid History" to see the pattern.

Also, the underbidder seems to have a lot of bid retractions on his profile as well.

Not sure what to make of the transaction.

Most auctions these days are pretty straightforward. This one's a head-scratcher.