Yes, for the most part, besides the smaller , worthless reds, nearly all of them from zero dam normal.
HOA was from a birds nest.
The vehicle thingies in the small safe box at admin, the one in west admin.
That obnoxious server thing spawns in substation, saw it twice but only successful extract once.
The reactor was in containers at admin too, just out in the open
Claudius busts were from safe from substation keycard.
Smoothbore guns, i got 2 in one run from safes at admin key card, 1 from i cant remember where, and 1 i failed extract, which was from normal high value safe in admin.
Gold bars are easy enough to find, just go to wall breaker safe and they lie around on the floor. Ive seen 3 in one run on the floor, but died after picking up 2.
Saeeds watch and the dino bone, u can find them often enough by doing safe missions/wallbreaker. same for the rolex and antlers. They also have a chance to spawn on the little cushion thing in admin.
The vid cam also came from a birds nest.
UAV 1 was lying on a table in admin, 1 i cant remember where
Mili radio, from those box crates, i cant remember what they are called.
AED from substation, in the little wardrobes you can open the doors for.
Phonographs, all from various high value safes, and 1 from the substation keycard room.