I'm pretty sure I heard about that when I was over there.
It was in late Summer. The firing point was right over the hill from some German town. The guy who lost the weapon was an E6 and treated his crew like crap. The last day of the field problem the supposedly left his LBE, Kevlar and rifle leaning against a tree and didn't realize it until he got to the wash rack.
He told the Battery Commander, they went back to the point and found the LBE and Kevlar but no rifle. There were some German nationals wandering around the firing point but they left almost immediately.
EVERYTHING STOPPED
All the vehicles went into a motor pool where they were searched and put under guard and the entire battery went back to the firing point where we spent the next 3 weeks searching for the weapon from dawn to dark, getting rousted out of our beds at all hours of the night and searched and questioned by CID.
No shower runs, no PX runs, no laundry runs and no hot food (not that we ever got hot food in the field anyway) just MREs twice a day.
After three week they sent us to Camp Aachen for another 2 week of the same treatment except we got to do laundry and take showers.
After that they sent us back to Peden Barracks. The working theory was that one of three people in his section disassembled the weapon and scattered it along the tank trail. Those three guys were split up and sent to other posts where they were interrogated for 6 months. The E6 was reduced to E5 and the Platoon leader was passed over for promotion which effectively ended his career.
The weapon was never found. I still think it's in so German's attic.