My guess is that it did not FALL off... sorry for the bad news.
IND has replacement covers. I went with M5 paint scheme. Fit was perfect!
| 2011 M3 Sedan | Le Mans Blue | M-DCT | ZC2 | ZCP | ZP3 | Moonroof | Enhanced Premium Sound | Dinan exhaust | Dinan software | Dinan pulley | Dinan intake | Dinan pedals | Bimmian LED interior | Lux H8 V3 | WeissLicht PY24W LED | 20% tint | IND reflectors | IND front grills | IND key hole cover | IND hood vents | IND M5 mirror covers | Reus Systems audio | Verstraβe shifter paddles | BBS LM 20x9 et 15 and 20x10.5 et 15 | Hankook Ventus V12 255/30/20 and 295/25/20 | Red BBS Racing lug nut kit | H&R Sport springs |