Edit: user defrost provided some good looking context comment exactly of the form I was looking for, thanks. The specifics of the available technology matters when assessing these claims.

For some reason I'm actually skeptical it has actually been found. A cynical reading is they scanned all the places people were ever likely to intentionally stop on that road and found nothing. So harm is just very unlikely, but leaving the item unaccounted for was just really, really bad press. I want to hear more about the sensitivity of this scanning device, particularly when used at this speed, and from someone knowledgeable in the field.