It was loose when I obtained the cabinet.  The cabinet had been converted to a Ms. Pac-Man so I thought this piece might have been from the conversion.  I did notice remnants of some kind of tape, but I thought that was just the handywork of some inventive arcade operator.  I guess I'll see if I can come up with a better way to secure it other than electrical tape.  I just can't bring myself to use electrical tape in this application.