Just some items ( not implying anything about this poor man's murder, just posting items someone with a safe might store inside their safe) guns, other weapons, cash, drugs, jewellery, personal papers etc.I think he was hiding from the cops the whole time they were looking for him. That's certainly a plot twist you don't see every day in a missing persons search.
I don't think he still had the stolen items with him 3 days after the murder though. I recall reading he ditched the guns he stole but I didn't see anything else mentioned. I'm just trying to figure out what possibly could have been in that safe that was worth murdering someone for. IMO