Yes, they claimed it was predator proof.
This may be the reason it was still able to be pushed open because it was blocked from shutting properly. Lesson learned, if having deep litter, install it higher up to keep the runs clear of shavings.
You definitely want an auto pop door that locks, otherwise you may as well leave the coop wide open at night, raccoons have very nibble hands and would be right in there in no time. On another note have you thought about removing the louvres in your gable ventilation and screwing hardware cloth...
I am bitten relentlessly by mosquitos and midges. Have you got standing water anywhere near, like an open water butt, if so see about getting it tightly covered so they cannot lay eggs in the water.
I've just had another look at the pictures of your coop and I notice you have louvres on one side high up how about putting some on the opposite side then you would have blow straight through to take the heat out or even just hardware cloth on one or both of them. Depends on the aesthetics and...
Think maybe a string of the solar fairy lights would be better, as you are only aiming for enough light for them to see to be able to jump up to the perches not have a bright light, some people use this in winter to keep them laying, which is not for me.
I have a string of solar fairy lights in mine, not too much light but enough for them to see to get on the perch.
Yes I would defo lock them in for at least 5 days it has to imprint on chicken minds that that is home, as this is a temporary measure it shouldn't impact on your certification but...