A lot of time is spent in the server by people asking where they can get certain items so im going to list as many as i can here, im bound to forget some or maybe even give the incorrect location so feel free to correct me.

Keymaker kit = big metal building with blue doors (dotted around the map, some for sure on each of the airfields) drop from a zombie

Lockbox = Business suit zombie

Combo lock = police/overall wearing zombie

Generator = Industrial/tec building

Sledgehammer handle/head = Barn/zombies that frequent barns

Chainsaw fuel = Grocery Store/zombie loot