Part of my garage where I keep my Transformers board games got wet and I didn't see it because the game boxes covered it up. Some of my game boxes got damp and mouldy, not to mention some warping on the boxes from being wet.Some of the Transformers boxes that I decided to keep are also against the same wall but along a different part -- I pulled one box out and inspected the side that sits against the wall and there's no sign of water damage there.
My daughter has allowed me to keep my TF board games in her room (since I mostly just play them with her anyway)... but still frustrating.