I really hope it works this time! If a hog turns round and goes out again, it is possible it is because there is already another hog in there. I have seen them doing that here.
I probably shouldn’t say it, but there has been a marked absence of cats recently, after sometimes 3 a night visiting. Occasionally one strolls down the path but leaves again pretty quickly. I have even removed the bricks from the box. The only thing is a rat has been visiting instead. Luckily, for some reason, this one seems wary of the boxes and I only leave kitten biscuits in them, which hopefully it doesn’t like anyway!
Good luck with the new camera.