question about seperating silver contacts after removal

I just joined and had some questions about my silver recovery. Having just posted in the "introduce yourself" section, I commented that I recently got a large number of old, surplus electrical items. It will take quite awhile, but as I remove the contacts, should I separate them into waffle backed (are these always silver-tungsten?) and plain backed? When I finally get done with them (it could take a few months since I don't have much free time) I wasn't sure if separating them like this might assist with selling in the future. As I said in my initial post, some are as small as a pencil eraser diameter, the largest ones weight about 5.5 grams each.

Thanks a lot,

Mike