forgot all about posting this question. Lots on my mind lately.
On a second look I see that they are mostly the same . The pink looking ones I was looking at the underside of them, the side curved in like a bowl, on the top side they all look like solder color only shiny which I guess is silver.
I have always just tossed them in the trash. Never thought it was silver . Tossed probably fifty from old keyboards in trash. Probably would have tossed them even if knowing they were silver since I consider silver to be be a waste of time to recover. I guess if you had a large amount of it to recover it might be worth the effort.