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Defo looks like a rubber type of sealant glue. And with the square outlined hole that looks like a missing screw/nut I would sway more towards the glue type; almost like something flat was screwed and glued to that section...
Perhaps something pre-delivery or protective that is taken off routinely or something that you've lost... Find someone else F31 and have a look underneath? Lol
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F30 320d ED Melbourne Metallic, Vis Pack, Dakota Leather, & Other Goodies 
G29 M40i First Edition Frozen Orange  |