I know 100% this was the wreck location...but that is about it.
Other parts have the hand-written number "81" and "4381".
These numbers are written on numerous inspection hatches...which was common. This basically ID"d the hatch to a specific aircraft.
This hatch below is the large dorsal hatch, located right at the wing root. This is one of the hatches that has the "81".
I do not know what the "X14" means.
Mike