Dress to kilt
Here's why the box is so big. This is all the stuff Florence had made locally when she got off the star ship. Tools, equipment, and two space suits.
Terran space suits! You'd suffocate if you tried to wear them. Still think this box is for you?
Well, with that information, it would require some pretty fantastic leaps of logic to justify it as being mine.
But to get free stuff, those are leaps I'm willing to make!