i dont have a cham in the cage yet, but its a reptibreeze and for some reason the plastic on it kinda smells i would compare it to bad breath... it doesnt smell the hole room up but if i put my nose to it it does!
its made of aluminum, it wont rust. I doubt they use anything that could reduce the health of a reptile in anyway, especially with a cage. I wouldnt worry too much, just the smell of it being packaged for a long time