To the OP,
Looking at the pictures, chances are it has the full 16MB of Fast ram, and 2MB of Chip. That was all the 4000's were capable of addressing from the Motherboard slots, no matter what you put in the slots.
If you put 5x32MB in the slots (5 slots, one for chip ram, 4 for Fast), all that is addressed, is 4x4MB and 1x 2MB.
Nice machine, is quite the find.
My guess would be the machine sat in the corner, and people came and went, and ultimately they had a clear out, and someone said, what is this "Amiga" thing ? And all they got was a Shrug and a "I dunno", and it got tossed.