"You're dead?" Bakugo looks at the man with a weird expression, giving him a once over from head to tail. Either this guy got yanked from a time where he was alive, or whatever this place is doing is giving spirits corporeal form again.

The idea of summoning a dead person to help doesn't exactly run weird by him? Though that's relegated to fictional stories, movies, and games in his world. The fact it's real is... weird, but when dealing with other worlds, can you be that surprised?

As for the chest, it appears to be a navigator's chest, with a miniature globe, compass tools, spyglasses, and a case with supplies for charting maps.