My view on them not following him...
This isn't 1988. Men don't kidnap little girls and hold them for ransom in America anymore, too easy to get caught during the ransom negotiation/transaction with the advances in technology. Unfortunately there's only one reason strange men kidnap children in America these days and it's for SA. So no one would expect the kidnapper to drive by the child's house after they've kidnapped the child for the purpose of SA.
IMO the only reason LE was watching the house was in case the child came home or was allowed to come home, especially with the family deciding to wait at their campsite. Therefore a random guy dropping off what is probably just another sympathy card would hardly be suspicious.
This isn't 1988. Men don't kidnap little girls and hold them for ransom in America anymore, too easy to get caught during the ransom negotiation/transaction with the advances in technology. Unfortunately there's only one reason strange men kidnap children in America these days and it's for SA. So no one would expect the kidnapper to drive by the child's house after they've kidnapped the child for the purpose of SA.
IMO the only reason LE was watching the house was in case the child came home or was allowed to come home, especially with the family deciding to wait at their campsite. Therefore a random guy dropping off what is probably just another sympathy card would hardly be suspicious.