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I'd wait for a diesel guy to chime in as I'm not familiar with the void under there. A flexible magnet should give you some better control over the coat hanger though.
Ate you 100% certain that is where it went? I've dropped sockets, nuts, bolts, you name it before thinking they went one place but they actually went somewhere else. I would end up looking for ever in the wrong spot before I would notice it somewhere else.
I'm sorry I don'r know the answer but if necessary you can get an inspection camera from Harbor Freight for $80.00. I know no one wants to spend $80.00 on something you most likely will never use again but it might be worth the $80.00 just for the piece of mind. Here's the link: Digital Inspection Camera
Use shop vac with a small hose. I reduce the hose size down to a small 5/8 or 1/2 inch hose. Don't turn the vac on till the hose is in the area you need it to be.
I dont know anything about the 6.7's but I wohld look up a schematic and see where that cavity leads. I know it runs into the valley but dont know from there if its wide open to below or what....
Bad news bubba, It's somewhere in your oil system. You might get lucky and find it in your pan, but here are some screenshots of the breakdown of the engine. I would at the very least pull the engine pan and see if it doesn't fall in there, maybe it's stuck somewhere you can get to from the bottom side.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.