"I used to sweep the parking lot of a Goodwill and they would toss very interesting stuff in the dumpster. Hundreds of books. Like really expensive ones. Leather bound sets of classical works from the 1920s, early prints of sci-fi novels (I found a nice collectible copy of Dune recently), family bibles stacked thick with memories. Food dehydrators, paintings, collectible sports memorabilia, super valuable vintage tools and fixtures.
Most of it is just stuff that nobody bothered checking the value on before chucking it out, and it’s really sad."