When did it arrive? That is your property. However, if left unclaimed since you know it's there, he can dispose of it after a reasonable time. If you can't get it this weekend, let him know when you can get it next week. The best thing is for him to write "moved, return to sender." or the post office can forward it. He just needs to write "Moved, please forward to" then your new address.

A landlord cannot throw away mail. It is a crime.

The landlord would be allowed to return the package to sender if you don't come get it. The post office does that for free.

How long has it been at his house?

Anyway, all you have to do is get it this weekend - Problem Solved.

Federal crime

And you haven't forwarded your mail at the post office because.....?

I would be a federal crime if he does

If it is beyond 30 days, they are allowed to.

Update: based on the rest of the information, no, he cannot just throw it out. He should write "Return To Sender, no longer at this address" on the package and mail it out.

http://www.law.cornell.edu/uscode/text/1...

"Whoever takes any letter, postal card, or package out of any post office or any authorized depository for mail matter... before it has been delivered to the person to whom it was directed, with design to obstruct the correspondence, or to pry into the business or secrets of another, or opens, secretes, embezzles, or destroys the same, shall be fined under this title or imprisoned not more than five years, or both. "

Mail delivered to an official "mail box" at your house is under federal jurisdiction until it is "delivered to the person to whom it was directed."