Here's my totally random from nothing idea
98% of wire Mylar I've actually had tested that was grey was nickel.
1.9% was silver. And I've actually found a few silver palladium Mylars from razor and Logitech.
Both of those as well have had gold. But, most of their equipment is switched silver nickel cherry switches or not quite as good mtsb switches anyway so, ...
If you throw one or two in a giant pile of 5-10 lbs of wire nobody is going to complain, boardsort included. Reality is nobody is going to pay you silver content even if it is silver because it's expensive, selectively, to recover on these. There is only one way any major refinery uses to recover metal from flat wire, including LCD films, X-rays, and keyboard plastics. Hydro acidic distillation. That 15 cents MLS stated (today's base rate it's probably about 12) costs them about 10 cents to get to.
Nobody is going to flip out over one or two, and nobody is going to flip out over fake glass diamonds in a 995 palladium ring either. But your not going to get actual recovery for it.
If you strip insulated silver wire you'll get $15 per ounce for the 875 silver core. If you pull the silver out of laminate you'll get $15 per ounce for the 875 silver. If you hand someone an ounce of silver in a 2 lb block Of lucite your get $2 per lb. this flat laminate is the same thing.
There's a note up top here stickied that covers gold laminate. It's the same issue
Boardsort doesn't want 20 lbs of keyboard sheets. Nor do they want 20 lbs of gold laminate, nickel, silver. ...
Bottom line. If you have one and you're sending/bringing in, wire toss it in with the wire. No you're not getting paid anything (worthwhile) for it nor is anyone else going to pay you for it. It WILL however get properly recycled.
The inside scoop here. When I have lots (lbs) in a single batch I bring them in with my plastics to a local plastics company who buys my plastics (a long story posted elsewhere). I get 9 cents per lb. reason being they make custom displays with glossy sides (silveride aka Ag+Al) and they simply cut and melt and mold the bare silver plastic in (no idea how it works, they pay I smile). How many keyboards does it take to get one lb? Apx 250 80 key. 100-150 full size keyboards and over 500 base notebook laptops.
So that's as detailed as i can get on this overall.
-- my grades are my own and do not represent an offer from boardsort, nor are they guaranteed. Please keep that in mind.