I lost a lash cap one time , we knew it did not go into a black hole but what 3 hrs later found it sitting on the K frame / sway bar strap.
The other time that comes to mind we had the engine on the mobile service oil rig torn apart , dropped the o ring for the cooler as it came off , no new O ring provided with the part of course so you need to understand these get paid $1000s / hr so down time is a huge cost & it would have been at least 24 hrs to ship in the o ring , took about 3 hours to find it wedged into the tread of the tire of the truck in the next bay !