Opportunity for stuff with silver in it

Hi all! Was at a yard today I buy e-waste from and the manager showed me some stuff I'm entirely clueless about (this is far more common than I'm happy with lol!). All of them are aircraft components and all of them pinged "silver" on his materials gun, some with brass, some with aluminum and so on and one part, the block filter shown separately, he said pinged at 92% which seems awfully high. Does anyone have experience with this kind of material? And if so...what's the opportunity here?







And rather than start a different thread, anyone ever disassemble aircraft power relays? Have a few hundred pounds offered but can't find anything in the forum or am just not searching the right terms. They're like this stock image and weigh max 5lbs or so:



Many thanks in advance!