Yep, these X5's swallow up parts and tools like it's nothing. My 4.6 has eaten an o-ring, a valve cover + washer, a 10mm socket, and a 10mm/11mm ratcheting combo wrench. Neither have come out after 1000 miles of driving so they must be lodged in pretty deep.

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2003 X5 4.6 | 2000 540i Touring

Formerly owned:
2004 Range Rover | 2000 M5 | 2000 540i/6
1995 750il | 2003 Mercedes S500 | 2003 540i/6