Ever walk into a room and forgot why you went there in the first place ?
Ever forget to empty the loose pocket change, before putting your clothes in the washer ?

While I can't really help you with that, I can help you with this;
Items inside of deposit boxes and most safes will be highlighted.
"WAIT, ISN'T THAT CHEATING ?????"
Not really, until the safe or deposit box gets opened, the items don't actually spawn, and cannot have a contour applied to them. Simply, this won't help you find random loose loot, only loot you are mildly aware of.

Additional items outside of deposit boxes/safes, that will be highlighted:
The weapons inside of the cases (Firestarter Day 1), when opened.

NOTES:
Uses mod override
In order to avoid an issue w/ the cash roll also highlighting the Rome Book, I have removed the book model. If you don't like that change, I made an alternate version that doesn't remove the book model, causing the book to be highlighted.

KNOWN ISSUES:
Highlighted items outside of Big Oil Day 1 and Armored Transport:Underpass boundaries. This is due to and odd level design choice, leaving me unable to fix that issue.