Actually that A2000 keyboard probably is an NMB "space invader". I've got one and it doesn't have a Commodore symbol on the left Amiga key.
OK. There should however be a rivet visible between the Del and Help keys. If there is one in the keyboard in the auction, it is hard to see.
BTW, have you done the acetone test on your keyboard to see if the keycaps are PBT or ABS?
Hmm.. I think I noticed something with the Mitsumi keyboards. The numpad-decimal point is too high up, at the same height as the middle of the 0 symbol on the 0 key. I see this both on Amigas and on Mitsumi's PC keyboards. The decimal point on the keyboard in the auction is like a Mitsumi...
On the NMB keyboard the point is on the baseline of the 0.