What i actually wanted to know is if there is gold at all in those eproms.
If you see no yellow once you split it open, I would say the answer is no. I know that is true with the ceramic DIPs and would guess it's the same with the Eproms. In the ceramic DIPs, the gold was on the tips of the internal "fingers" and on the entire base, where the chip is mounted. If I recall, about a 16 lead ceramic dip, with gold, from the 80s-90s, was worth about 15 cents in gold. With no yellow, you might find silver, which is white and nearly worthless, or epoxy, which is totally worthless. The one at the bottom of the last (4th) photo, seems to have no PM value, unless you used chemicals on it.
I once played around with the ceramic DIPs, with Kovar leads, by heating them to a fairly low temp (the lowest temp that would work is best), maybe about 700F, and then quenching them in water. The 2 ceramic layers (which contain about 5% glass frit) are held together by heating them. When fired, the glass frit in each layer melts and bonds. I think they also add a thing layer of extra glass between the ceramic. When heated and quenched, the glass pulverizes and everything falls apart with a little assistance in a tumbler and maybe some balls or weights, like in a cement mixer. The idea was then to remove all the Kovar with a magnet, strip the gold from the Kovar with cyanide, and used AR on the gold on the ceramic. I never did this in bulk, but the experiments proved it worked. It's been about 45 years and I can't remember the details.