Hi Kitty -
There have been several other posters here have gone through the same thing and I'm sure they will be along.
My only thoughts are if you can call him, tell him "if you aren't here by ________ your stuff will be waiting for trash pickup" and if it's too much for stuff for trash you can usually hire someone to come haul it off for you. Yeah, you would have to pay for it but the peace you'd get from getting rid of it, to me, would be worth it.
Also if there's any furniture and it's in decent shape, some places will pick it up.
I have a feeling he will just let it go wherever. Crack will make do that (been there, done that but not anymore)
Good luck!
Amy