Doesnt matter what it has come out off, if its 5spd its not a Bugeye STI box,
The price is a good indicator aswell, you wont get a 6spd for 750euro..
Typical example of if its too good to be true its not true.
That wrx box is probably worth 4 to 500 max.
Go back, get your money back and give him a kick in the stones 4 himself.. is he from Limerick by any chance?
Dont think that he didnt know either, 6spds are double the weight, have a sump, have an oil pump in them with oil pipes running up there side, have a lift lever on gear stick with cable going to lever on box so reverse can be engaged, flywheel is different aswell