What happened to 1248 is uncertain. There is no documentation that it was parted out in Chicago, sent back to Dearborn, or handled otherwise. It just disappeared along with supporting documentation back in Dearborn. We are left with theories.
Add that to the theory, that at least one of the two hand-built prototypes (#9500 or #9501) was not "crushed" but parted out.
The termination of the Continental Division and the destruction of records has led to many un-answered questions.