There was some of this when my mother died. 3 older brothers. B1 and B3 were executors and had medical POA. B2 was neither (though, if I had died before Mom did, B2 would have been the administrator on the part of the estate that would be held for my surviving children). B3 was local to Mom; the rest of us had moved varying distances away.
Either B2 or B3 looked around, just after the funeral, and sent a miffed-sounding email saying he’d seen a bunch of empty jewelry boxes. Not accusing us of anything, necessarily, but clearly putting that out as an option.
B1 and I did the initial household inventory, a week or two after Mom died. We took photos before touching anything.
Her dresser drawer had compartments containing all her jewelry, and a bunch of ordinary coins (quarters, I think). B3 wanted to know where all the gold coins got to, that he could see in the photo. No, no gold coins. that was the quarters, looking goldish because of the flash from the digital camera. And while I could not speak to the contents of most of those empty jewelry boxes, one of them I recognized as having contained earrings I gave Mom - which I found in the jewelry section of the dresser. Which may or may not have convinced B2/B3 that we had not made off with other jewelry (though pieces she was known to have owned were found and documented).
Lots more along those lines. I no longer have any contact with B2. Limited with B3. Cordial with B1.
Anyway: regarding the OP’s brother: it sounds like his property is unlikely to be worth putting a lot of effort into retaining, though if you can manage, it’d be useful to pay a quick visit and look around. The car, at least, would be worth taking, as long as it’s paid off. If it’s not, let the bank reposses it. I don’t know how the legality of transferring title would work, but it might require going through probate. The landlord can just sell / dump everything else.
We were in the position, last year, of needing to dispose of a whole household full of furniture when FIL died and MIL went into assisted living. We tried donating it - and while an agency would have taken much of it, they would not have taken it all - and they were scheduling 3 months out. We wound up including it in the condo sale - problem solved. The relevance to your case was that donating stuff can be a lot more work than you want to put in, especially the big stuff.
“We Take Household Junk”-type of places will often haul stuff away for a fee - with, I gather, the understanding that they’ll sell what they can. I don’t know if you get a credit against the fees if they obtain much. But in your specific situation, let the landlord handle that!