I have only looked at one box so far. It looks like the stuff came from some kind of clothing factory. Some of the stuff seems to be trims from cutting out patterns. There is still a lot of fabric left, but it isn't the type I want. There is a lot in there that I do like. So far I have found 3 jelly rolls in tact. There are lots and lots of single squares cut out. Even a whole bag of denim fabric that could be used in a quilt if someone wanted to cut it into shapes. Apparently that, too, is remnants of pattern trim, but enough to make some kind of denim quilt design. (Not my bag).
I will sort out what I want to keep, give to my friends what they want, and the rest to Goodwill.