My guess is that this guy is using your address for a credit card theft ring or drug shipments. I would stay away from putting his picture in your mailbox so he sees it. Better to see if local PD can squat on your house if his timing has any consistencies. Also, it seems like hes wearing the same clothes every visit... anyone else notice that?
I agree. I think it's more likely he's using your address for drug shipments or similar.
From at least 1 of your videos, it shows him removing a parcel.
Simple fact is, you'd know if you'd ordered a parcel and it hadn't arrived (because he'd stolen it). So the fact parcels are arriving and being taken from your mailbox without you suffering any loss suggests it's his mail being directed there, and the most likely reason you'd want to re-direct mail to someone else's address is because it contains something illegal such as drugs, firearms, illegal porn or stolen items such as CC's.
Personally, I'd avoid putting a picture of him up on your mail box. If he knows you have him on CCTV, it might make you a target, especially if he believes you haven't already handed it over to the police. That's setting you up for a retrieval burglary at the least as he's going to want the footage, or potentially a revenge shooting at the worst. I'm going to hazard a guess the reason he's using a totalled auction car is because it isn't easily traceable. Probably bought for cash from the person who bought it at auction and not registered. I doubt he'd buy from the auction directly, too traceable due to the paperwork and CCTV.
The obvious course of action here would be to point out to the police that you're not missing any mail so you suspect he might be shipping drugs or similar to your address. If it's delivered on a specific day / s, maybe you could persuade someone from the PD to intercept the mail man or the mail at your address and look inside for you. If it's something legal but embarrassing like sex toys that will be the end of it. If it's something illegal, it will probably lead to a stakeout and arrest. Either way, it lets you get on with your life - if it's legal but something he didn't want delivered to his home, you put up a locking box. If it's illegal, he goes to prison. Either way, case closed.