That's pretty much what I've gotten from my dealer so far...
"We can't hear anything - move along, nothing to see here."
I agree, it's really annoying... and I pretty much always hear the rattle above 45-50 MPH in the right front door area.
2012 Focus Ti Hatch | Ingot Silver | 401A, Nav, Winter Pkg, Moon Roof, Parking Tech. Pkg
Build Date: 12/2/2011 | New APIM: 4/4/2012
MFT: Factory v2.11, 3/14/12 USB/Web > v3.0.2, 9/24/12 USB/Web > v3.2.2, 1/24/13 USB/Web > v3.5.1