Maybe this idea has already been posted, I haven’t read through all the threads…
If I had a grown son with no job and a girlfriend living in my house, who liked camping, didn’t like shoes, and had emotional issues, I would immediately hide him inside my house. I would do that if my only focus was my dumdum son and not what anyone else is experiencing because of his actions.
I would make sure I could hide him quickly if LE showed up at any time, and preferably in his own room with all his smells already there if they brought search dogs.
In BL’s room there is a support column covered in Sheetrock, with a wood frame and hollow inside. It has plenty of room for him to stand inside of it for however long LE might be there, and easy to exit when they leave.
No new painting would be required if done carefully with a Sheetrock knife. I would take one hinge off of two doors in the house, use scrap leftover wood from the van project, and a wire to pull the hinged Sheetrock panel shut. The same could go for his built-in book cases, or the drop down in the ceiling for the air duct. There are lots of options in that house.
I would create diversions like leaving his car at a park long enough to get an abandoned vehicle sticker, and have him appear outside in the neighborhood so the neighbors can watch him leave. I might even charge a phone completely, leave it on, put it in a waterproof pouch and toss it in the swamp where his car is parked. I would make sure several people saw him leave the house and not come back. He would be back though, and I would have him climb out of the camper in the middle of the night, slide under the slightly opened garage door and walk into the house and stay there.
I would not risk my dumdum son getting shot by LE or by a crazy “vigilante”, or dying of hunger alone. I would lawyer up before he even got home and plan to point in every direction except my house. My possible theory is that he is hiding inside the house. It might be a stretch, but it seems more likely than dumdum, who can’t survive without mom and dad, being able to evade the general public and LE for a month.