I didn't find anything but yesterday , I dropped a small jeweler screwdriver in the engine bay near the expansion tank. Never found it after a few hours searching with magnet.
So hopefully I can come back soon and tell you I found a screwdriver in the engine bay

__________________
His : 2005 X5 4.8is (SOLD)
Hers: 2007 X5 3.0si (SOLD)
_______________
Retired:
1999 518
2000 323i
2002 M3 (beautiful car)
2003 330Ci