I'm a little late in here but over here in the UK we established the squeak/rattle noise was most likely the inertia reel of your seatbelt which is mounted underneath the seat. The fix is simply to pack the area around it with foam. I have a 2012 F13 and have never had this particular problem though I know many here have. Instead I have had other seat knocking woes. It's all just poor design.
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