I don’t think they know yet.....my money’s on an illegal.
FYI, this is way up in very rural northern VT. Although route 91 is an interstate that runs north and south from the Canadian border near Montreal down along the border between VT/NH following the CT river valley all the way to Hartford then New Haven, CT.
So, I would assume this is a major trafficking route of the cartels bringing products and people in from Canada to the US.
There is a lot of illegal activity in that area... Canadian natives are heavily into smuggling cigarettes, drugs, etc... May have been something related to that, but they smuggle humans too.