Is the home a big mess?
If it is, your BF can try something a friend of mine did and it worked for him. He went to pick up his daughter, while at her home, he decided to take a few pictures of HER. He did get pics of her, but he framed the photos so that it also showed the mess, including dog feces on the floor. he then took the pictures to CPS and asked them to check the home out. Since he had pictures, they went right away.
Maybe your BF can try the same thing. Either way, it sounds like he needs to contact CPS again.
Is the court order in Maine?
If it is then he'll have to file there since that is his son's legal residence. He really should hire an attorney, but if he can't he should gather up all of his documentation and get a consult with one before he files pro-se.

