TMZ reported "we're told there are several acres of rural land behind this guy's property, which is apparently where this footage was taken ... along what we're told is a rugged sugar sand path that hardly anyone ever ventures down ... on foot or anything else.
Weirdly enough, this unidentified guy was cruising down the trail on a bicycle ... and having a difficult time at it, as you can see. He's riding with an oversized backpack on, and heavy clothing ... and in the homeowner's eyes, was trying to lay low.
Add on the fact this mystery man -- at least at first glance -- appears to bear a passing resemblance to Laundrie in the face ... and we might have a legit sighting on our hands.