[hmm this sounds familiar at some point]
I imagine this box is kinda huge and heavy stainless steel box, that's why it needs kinda special lock and password.
so.. I'll try to knock it repeatedly while shouting, "DAVIEEEEE!!!! ARE YOU IN THERE???? ANSWER MEEE!! I'MMA GO SAVE YOU IF YOU'RE ACTUALLY INSIDE OF THIS BOX!!!!"
then if I don't get an answer like, "ANT?! WHY DO YA HAVE TO ASK?!! THIS IS ALL YOUR DOING RIGHT??!!! OPEN UP!! LET ME OUT! Goddamned this crazy fox!!"
if the situation are not gonna be something like this, I'd just simply reject the box, or just abandon it outside. I won't risk myself for something dangerous tho~