I ran into a stack of NEXT keyboards (5 of them). They all seem to be new-in-box. They are inside regular shipping boxes, and seem to have been shipped as replacement keyboards.
These are non-ADB keyboards with the L-shaped Return key. From what I gather from the net, the L-shaped Return key was a later revision to the keyboard (the first version having a horizontal Return key).
See pictures at
http://picasaweb.google.com/simplepractices/FSNEXTNonADBKeyboardSelling for $12 each + shipping.
/Peter