Five years ago, when the district for which I work consolidated the middle and high schools, an enormous amount of glassware was discarded from our science stock rooms. We had stuff that was decades old. Times and teaching methods change, as do safety regs, so admin decided not to move any of it. The district is in sore financial straits these days...black market glassware sales wouldn't solve all our problems, but....
I expect all that stuff did, in fact, end up getting sold by the demolition company or dome of its savvier mooks.