My wife and I used to go dumpster diving.. We came back with a lot of stuff that I still use around the farm today. I was never interested in scrapping, I was after things I could use. Lots of pipe and electrical supplies, broken laptops I could salvage the 18650 batteries from, angle iron, fasteners, etc.
Found almost 400 canning jars in a dumpster once.. They still had food in them that appeared to have mold and all the tops were rusted. We brought those home, buried the food next to our fruit trees for fertilizer, then gave the canning jars a bath in muriatic acid after several trips through the dishwasher. By the time we were done, they looked brand new again. We still use them today.
Found a torpedo heater that wouldn't run.. Looked almost brand new but for a couple of scratches from being thrown into the dumpster.. A bug had made a nest in the nozzle.. Cleaned it out and it still works perfectly today.
Found an entire crate of keyboards too.. 32 of them in a big box packed in foam.. all brand new. When my keyboard gets dirty these days, I just throw it out and grab another one.
Also found an entire box of Cat5E cable.. Some of that stuff runs through my home to wire up the security cameras.
Probably one of the best finds was from a retail store going out of business.. We found an entire 40 yard dumpster full of gondola shelving.. Good ones.. 4 feet wide, 30 inches deep. Those things are like $60 for each shelf.. We scored so many of those, it took three trips in my truck to bring them back. We chop off the back hooks and just screw them to 2x4's. My entire basement is filled with those things along the walls. You could put an engine block on those shelves and they wouldn't even flex.
Those were good days.. Dumpster diving is a lot of fun and can be quite rewarding. Unfortunately, it has also become quite popular and some people would leave a mess behind them as they emptied out the dumpsters to get what they want and didn't bother picking up after themselves. Businesses complain, then the cops start doing routine checks. It's always the a-holes that ruin it for everyone.
Looking back.. of all the supplies I scored, I probably saved myself somewhere around $10,000.