I want to share something with people and this is the best place i could think of.
I wanted to check what can be found in the dumpster, so i made a new save and a sim with a freegan and collector traits for best finds, disabled her motive decay, then made a generic lot with 4 dumpsters i kept constantly overflowing with cheats and landfill trait, put her on the lot and fenced her in (so townies wouldn't disturb her). then i made her do nothing but dive for deals for an entire sim week. I know it's not as informative as looking into game files but i think it sheds at least some light on what can be found in dumpster.
So:
Money: 2281(there was even a find as high as 864 simoleons)
Bits and pieces: 1586 screws, 500 banana peels
total of items: 404
Dyes: 87
bikes: 14
collectibes and fish: 6
beds: 22
chairs: 27
desk chairs: 7
armchairs: 12
couches: 16
barstools and benches: 12
tables: 22
coffe tables: 15
accent tables: 22
desks: 3
counters: 5
cabinets: 3
sinks: 14
toilets: 4
showers:5
tubs: 9
shower/tub combos: 3
deco plants: 22
pictures: 31
pet beds: 3
computers: 5
tv: 6
music: 4
fridges: 6
stoves: 7
small appliances: 3
dressers: 9