you will probably be fine. screws can fall out over time and if you have ever had your car serviced with them and someone has removed the cowl, it is always possible that it could have happened at the dealership. they will probably just pop in a screw for you if they end up removing and putting it back on. I wouldnt worry about your DP clamps either.
MY Build Log
08 AW 135i | Cobb | ETS FMIC | ER CP w/ Tial Bov | AR Catted Downpipes | Berk Mids | Meisterschaft GT SUS 1M |M3 Control Arms | M3 Sways | M3 Rear Subframe Bushings | Wavetrac LSD | AST 4200 DA Coilovers | HRE R43 | Hankook R-S3 |Full BMW Performance Interior | Revozport 1M Raze Aero Package in Satin Carbon |1M Body Conversion|