The Backbox key is found dangling on a hook on the inside of the coin door.  This means you need a key to the coin door before you can open it to find the Backbox key.  If the coin door key is missing you'll have a bit more trouble since you definitely need this key in order to get inside the game.  In some cases I've received games that were missing the Backbox key.  For those games, the first thing I do is see if I can turn the lock by inserting a screwdriver in the key hole. It could be that someone else already realized the problem and fixed it by removing the guts of the lock cylinder after prying the Backbox lid off.  If not, I see if I can use a large screw driver to pry open the metal lid without damaging stuff, remove the lock cylinder, and using needle-nose pliers, I pull out the components of the locking mechanism.  These are typically small brass looking inserts with a small spring inside the lock assembly. Of course the preferred way to handle the problem is to simply replace the lock cylinder with a new one once you get the Backbox open.  I use a lock assembly that matches the front door so that means I often have to replace both lock assemblies.

Backbox Keys
You can see the keys hanging
on the inside of the coin door.

 

 

 

 

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