A few questions I could not find in search.

There's Plastic, Steel, Copper, Brass and Silver in the relays.
The contact faces will be Silver on a Copper slug. Not a high bearing Silver return though.
If most of the plastic case is smashed off them they should be able to go as 'electric motors' or 'Copper bearing steel'.

If you got a ton or more you could get a specific price for them.

Me? I have too much time and will scrap that sort of stuff for the Copper wire and Contacts/Silver.
And I have not found where I could sell it yet........