Look at it this way, take the Nickel, Iron, and Manganese out of the equation. You have 32 copper and 18 silver - that is very close to specs 32/50=64% CU, 18/50=36% AG. Now assume the XRF read 20 microns deep and the Nickel plating is 10 microns deep (the 20 microns of read depth is your 100% on the XRF readout). 50% of the 20 microns is Nickel and then close to specs for the next 10 microns. I'm probably oversimplifying but point made.
The iron content is too insignificant to cause magnetism in my scenario.
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