The inserts dont look like they have been added afterwards, they look exactly like the ones on IPDB
This is what is on IPDB:"Pictured in the listing is a backbox with five green inserts on the top. There were no lamps or other special lights mounted inside to shine through these inserts. We asked designer John Borg if special lighting was intended and if any of these backboxes made it into production. He replied:
I believe I had some GI and flash in the backbox. It would cast a haze on the big molded topper. Costed out (was eliminated) before production. I had one of the early 30 or so prototypes and don’t remember if my game had these inserts added to the top of the backbox or not. I’m thinking not. [The game pictured] must have been an engineering sample they sold."http://www.ipdb.org/showpic.pl?id=2493&picno=57782
