You're joking right? That was an absolute steal at the current price of old Amiga stuff. I'd say the A4000 m/b alone (forget the stupid case) is worth at least $300+, the PicassoIV board would fetch $400 and the token ring card probably $80+. You should probably be sending the seller more money. :-P
An another thing, stop hoarding Amiga stuff. Don't you have about five of these similar systems already? :-P