When you say they were set up on the checkout counter as if ready for use, do you mean they were actually using these machines in the course of their business?
If you talk to them and they are just going to throw them in a dumpster, you should at least ask to harvest the boards, drives, memory, etc. I'm sure there's someone around here who could use one of those, and you can never have too many SCSI drives...

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The machines weren't being actively used when I was there, but they all appeared to have been used recently in the course of business (all cables looked to be connected and they were prominently on the sales desk and in an open office). I may go back and ask about them tomorrow depending on my schedule, and if any of them work properly may grab the CPU units if noone else wants them. I don't know what I'd do with three Apple 12" RGB monitors and an Apple 13" Trinitron monitor. The obvious answer is, of course, assemble a vintage Mac network and party like it's 1989, but sadly I just don't have the space for that.