Guy Abandoned A Motorcycle At My House. How Do I Get Rid Of This Thing?

So, back around Halloween, I was working on a couple of my bikes when this dude shows up asking if I work on bikes... I tell him that I do my own maintenance, but I don't work on other people's stuff.

Well, 2 hours later he shows up with this clapped out POS that he wants me to look at. Simple fix. So I tell him I'll do it. Well, turns out he bought the wrong part and I can't do anything. I tell him this and he says he'll come get the bike. I'm not expecting payment (literally took me about 10 seconds to see that this wasn't going to work).

Here's the rub- dude has fallen off the planet. Totally ghosted me. I don't have an address for him, just a phone number and a first name.

How can I get this thing out of my garage without him being able to come after me for money? I have no interest in trying to sell it, I just want it out of my garage.

I've considered sending him a message that he's got 24 hours and I'm putting it on the curb and letting the hood do its thing, but IDK if there's some legal possession thing or whatever.

I don't have any reason to suspect its stolen (I can't adequately describe what a piece of shit this thing is- think amazon bike except worse.) It's not plated, so I can't just find him via DMV search or whatever.

Atlanta, GA