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Long shot... have them check the rear brakes... I had that same problem with my e90 where i would hear this noise from the back as I was backing up.
Turned out that it was the rear brakes grabbing a little bit when backing up.
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2008 335i 6MT - Dinan tuned stge 2
1986 325es - SOLD
2012 BMW X3 35i AW on RB Msport - JB3 @ 4.0PSi over stock, 20x9F and 20x10.5R Stance SC-5ive, H&R lowering springs. - SOLD
2006 BMW 330i - //M rep kit with custom exhaust, H&R springs, 19" VMR - SOLD
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