Found Nazi Memorabilia in Antique Store

Visiting rural Wisconsin.

Was wandering through town, and came across an antique store selling a few pieces of Nazi memorabilia. Items were a belt and photo of Hitler shaking hands with Himmler. The belt was labeled “pre-war.”

I snapped a pic of the items, and as I did so, I noticed the store owner eying me warily.

It made me feel uncomfortable, and I immediately left.

Now that it’s sat with me for a bit, I am wondering if I should do more. Shouldn’t these items be handed over to a museum or a rabbi? Should I approach the store owner? — I certainly can do so without revealing I am Jewish; but it still makes me feel uneasy. Concerns these could be a dog whistle?

What is the appropriate approach? Any suggestions? Community resources to assist?