Probably because they want the parents to describe the PJs?
My cousin and I "found" a toddler once in Port A. We got to our rental late, get unpacked and get the house set up because everyone else is arriving the next day, and go to bed. My cousin comes in my room and wakes me up at like 2:00 AM because she thinks she hears a baby crying right outside. We go out, and sure enough there's a little toddler wandering around all by itself crying. My cousin ran down and tried to console him and I called 911, then went walking around the general area hoping I'd run into someone frantically looking for their kid. Didn't find anyone, but did see a house with the front door wide open. I hung out and waited for the cop to show up, because no way was I walking up to a strange house with an open front door at 2:00 AM. Cop arrives and I explain what's going on. He calls for backup, because he's not walking into that house either. Backup finally arrives, and they go bang on the door frame "Hello! Anyone home? Police department!" They finally roust the family and mom freaks out crying and comes running down to get the kid. No one got in trouble, but of course the cops had to search the house, etc. One of the cops was taking my statement for the report and told me this happens more often than you'd think. Families come down and don't think about babyproofing their rental. Kid wakes up in an unfamiliar environment, gets up and starts walking around looking for mom and dad, and ends up walking outside and gets turned around and can't find their way back home.