There's at least 3 ALPS-type keyboards in that auction that I can spot, but some of them are nearly impossible to identify, like the Chicony. I'm sure there's someone on geekhack who can, but I don't know who.
The only reason to buy this lot would be if you were going to rip out the ALPS switches from those 3 keyboards and use them for experiments, or needed the keys themselves for some kind of paint job experiments.
Or perhaps you want to play with the controllers and how to mod them for USB cables or whatever. Or you need the keyboard housings for paint jobs or to practice sawing off the numpad to make fake tenkeyless boards.
Don't buy this lot to "test switches", since there's really only one kind in there for you to try; the white ALPS (and even that's not guaranteed, they could be fakes on some).