Hi guys!
You might also be interested in knowing that I was contacted by a fellow historic BF investigator in Ohio, Doug Waller, who had a strikingly similar account he collected from another local there -- attaching pic he sent of his book (one of 3 he's written, I think), and illustrations from the case.
The Ohio case involved another accident scene which quickly disappeared, only the eyewitness missed seeing the cleanup crew (and there was a much bigger mess).
You can find Doug on Facebook if you'd like to talk to him about the case, he's a pleasant fellow, and has been collecting these stories for some years now out there.
One thing he asked when I talked to him was how far away and who is the nearest Federal authority in that area, because it would be unlikely that a state or municipal organization would have done the cleanup. The closest I could come up with was a few Federal authorities (FBI etc) located about an hour away in Augusta.
Food for thought.