Marantz 10B knob and grill

I had my 10B repaired. When I returned home and unpacked the tuner I found that one of the four smaller knobs (scope selector) and the metal grill from the wood cabinet was missing. They havn't been able to locate them, and they insist they will find replacements. I've waited for several weeks, so I have decided to try locating them on my own. Does anyone have information on where I might locate these items?