>they're probably more than what most people are looking to spend on a technically second-hand computer (even if they are like new and still under warranty)
Some people need to buy at these inflated prices anyway, and are ultimately willing to spend. Maybe it differs in your area but there's no risk in listing these on Facebook Marketplace or similar platforms and see the interest.
Edit: they're intended to be retail POS PCs, like cash registers. (The motherboard literally has a header for a cash drawer!) So unless you're a particular kind of retailer, you're not asking your distributor for them. If distributors aren't looking for them, our B2B buyers aren't buying them. If they were Elite/Prodesks, Optiplexes, or Thinkcenters, they'd probably be gone by now.
The only thing I've found that's annoying with these POS/Office builds across various brands and models from 2013-2017 is the PSUs are less reliable and end up failing if you're doing more than just running excel and outlook. The OEM PSUs are often priced at ~25-70% of the value of the entire machine. I've seen some people end up cutting a hole in the case and bolt an ATX PSU to the exterior.
Why don’t you part them out? The market for the parts will be more liquid. You might sell faster and at a higher price. You could try doing it once and see how it goes.
Some people need to buy at these inflated prices anyway, and are ultimately willing to spend. Maybe it differs in your area but there's no risk in listing these on Facebook Marketplace or similar platforms and see the interest.