BTW - I kind of wonder if you cabinet has been modified. It's very unusual to see that type of center drawer with the lift up type of cabinet (where the machine lifts automatically).
I've seen enough cabinet with the front cover panel busted - that would not surprise me at all if someone way back took it off and put something else on. You may be able to tell underneath if it had the mechanize to pull the cover panel up and out of the way.