I would not beat your self up of it .
The two most esteemed Japanese alloys are shakudo and shibuichi. Copper & silver but it's use seems as decorative
Copper and zinc are primarily brass I have had brass items that seemed very faint in color (more silver in color ) after grinding but hey it's brass .
I can't see any reason silver would be used pure . Nickel and Nickel alloys are used due to strength & pure nickel is ferris
True quality Stainless steel is non ferris and heavy , The yard guy might of wondered if it was a chunk of Stainless steel
Germain silver alloy is copper alloy with nickel and zinc. are consider decorative brass at the yards .
But PM use in electronics and RF shielding is what it's all about for the scrapper who organize those item types to sell at utmost true value
any brass alloy sold to yard is brass & I highly doubt the yard put it aside to sell as any thing more then brass.
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