IRIS 3120 (impostor) in Renton (Seattle area)

[compoobah at valleyimplants.com]

 I went down and wound up walking out with the IRIS. It has keyboard, buttons, monitor, cables and appears complete (including Winchester), but is not a 3120, and under intensive interrogation we obtained a signed confession to this and many other unsolved crimes.
It's a 2000 of some sort, but in a 3120 case and with a 3000 series keyboard. I'm not sure what the provenance is (some gunk on in, pretty clean and no beasties lurking), or whether the drive is set up fora Turbo 2k/3k system or a 2k (or nothing). ST-506 full-ht. drive but haven't gotten that far inside it yet.
It's loaded with bitplanes (8x BP3 boards), but 2 of them do not have the blue interconnect cable attached. Is this correct (are there any members skilled in IRIS lore?)