The problem with asking legal questions here is that you'll get posts
about what people believe *should* be true, but may bear no resemblance
to the law. Unless the post says "I'm a lawyer and ..." or "I had that
happen to me and ...", you shouldn't rely on it.

That said, and without giving you *advice*, I'll say that if it happened
to me, I would set the parcel aside, for some reasonable period, say a
month, and wait for something to happen. At the end of the month, I
would treat it as my own. If contacted, *I* would feel entitled to
storage and/or handling fees to return it (at his shipping expense). Or
tell him "Come and get it".

I also *believe* that this is covered by the Uniform Commercial Code,
which you should be able to find in a library.

IMHO,
Bob