What to do?

I bought these pair of uniface Swiss Shooting Plaques on Ebay Germany given the fabulous design and size (120mm).
Seller described these in German (I used translator) as silver. They seem to be aluminum.

Note the William Tell shooting at the apple on the boy's head. kinda neat assuming he doesnt miss.
I paid a fair amount, yet not crazy.
Would you:
1) Keep
2) Return
3) Sell
Seller described these in German (I used translator) as silver. They seem to be aluminum.

Note the William Tell shooting at the apple on the boy's head. kinda neat assuming he doesnt miss.
I paid a fair amount, yet not crazy.
Would you:
1) Keep
2) Return
3) Sell
0
Comments
Could they be hollow castings which make them light weight?
Billon alloy: 2 to 40% silver content
Life member #369 of the Royal Canadian Numismatic Association
Member of Canadian Association of Token Collectors
Collector of:
Canadian coins and pre-confederation tokens
Darkside proof/mint sets dated 1960
My Ebay
Took different snapshots and stitched them
What would you guys guess I paid for both...?
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