they will all b proofs ("S" mintmark=proof)
unless, they r morgans of peace, but u should be able to rim search ikes easily, tho i would cuz there might be cool things mixed in.
None of the ikes are 90% so they might resemble a 40% half more so but most of the ones I have found do appear to be solid with no real sign of copper in the rim.
The other thing is the sound test it should sound different than the copper nickle clad Ikes. and it would have to be minted in San Fran.