Yes, I was thinking that they may have heard an ATV also. That might explain seeing lights over the treetops, especially if the ATV was running up and down the ditches. It could also explain why there was no evidence discovered of a vehicle. I assume that the presence of a vehicle can be determined by means other than only cameras.
It's possible that they were correct about the date. No doubt LE has already investigated this and made a determination about whether or not it is related to the missing kids. Comments from LE about the vehicles seem to suggest that this was not related to the children's disappearance.
I am concerned that the neighbour didn't report this until a week after the kids disappeared. Sometimes our memories are not the best after a week. How much do we trust their memory? I don't know. Furthermore, the second witness' report was an additional week later, and only after he had spoken to the first witness. That makes his report even weaker.
"About a week after they spoke to Wong, police say they spoke to Justin Smith, the other nearby resident. Police say Smith told them on May 17 that he had spoken to Wong about the vehicle and that he also heard it in the early hours of May 2."
HALIFAX — Nova Scotia RCMP say they have found no evidence to back up witness accounts of a vehicle driving back and forth early in the morning near the rural, northeastern home where two young children went missing in May.
ca.news.yahoo.com