Well it must be a very strong raccoon because I can barely open the boxes. I put them on too tight but I also have clips on them that lock, they are drill on the inside so in order for me to open them i have to go inside and unlock it first. I will see about the warping. We've had alot of rain in my area and it been out in the rain since February, no warning. But we did put clear coat on. But we will see. I haven't seen any raccoons in my yard, I have 3 acres. I also have 4 beagles and a mastiff. So far they've scared away the rabbits and deer but I have yet to see any raccoons. But will keep an eye out.