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I don't have pictures but they are flat flexible sheets they seem to be made of mylar and according to a YouTuber who's video I watched they are embedded with silver they are commonly found in microwaves and touch-tone phones apparently any device that has touch buttons I have tried to search them on eBay but I cannot find the item at all what should I search in order to find these what are they called

Silver Mylar
Silver is a misnomer.
Old and high end equipment uses silver but most are a silver nickel tin alloy. Or even just nickel or tin on low end Chinese keyboards. If it’s small enough I toss it in my wire. Mixed wire for boardsort or alloy wire locally. Small like a 10 key or smaller. Or long narrow strips like cable interconnects.

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