I've seen those chips before. I would say they are worth $25 each (in a quantity of 500, $10 to $20 each).

I have ivory chips that belonged to Chester A. Arthur. I've owned chips that belonged to Herbert Hoover (I think I sent them to David Moore). I've also seen small crowns with the US seal on it that belonged to Dwight D, Eisenhower. (all are shown on page 35 of Dale Seymour's book)

The point is that they are not worth it.

A couple of years ago someone (I think it was James C) put some last issue Sands on ebay and got of $300 for one chip. Now we all know that 10,000 or so of these chips were bought from the sands. The chip is a $10 chip.

Mr B was offered $100 a chip. That is not enough. Please. The set is worth, at the most, $10k.

This is a perfect example of why, when offered a rare chip, you should low ball the seller. When you offer a more than fair price, the seller thinks he has gold and you'll never get the chip(s).