This is a Heiying, metal case for Nintendo switch games. It is brand new and unused, but was opened to see what it was like. It was not originally sold with a box, but came in a jiffy bag. It has not been used at all/switch games have not been inserted into it. Within the metal case is a kind of grey, rubber lining that supports ten switch games and SD cards on one side and 10 switch games and SD cards on the other.
eBay