get the model number of each one and google it, look for info on the unit from the manufacturer, also look for results in the list from ebay, to see if any of it is selling there. It's good if you can power them up, if so, you'll know if the ram and cpu are good, google those as well for ebay results, to see if they're selling, and for how much
if them, or parts from them are selling on ebay, you might try selling yours there too, even some can sell as vintage, if they're not selling, you can pull all the boards and sell them as computer scrap
There's lots of threads here on selling computer scrap
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