Flemoon IP54 Waterproof Box with Large Capacity Outdoor Weatherproof Box, Gray

will this fit a 10 guage extension cord?

What size screws should I buy to hang this on a concrete wall?

I see this says temporary use only. So it wouldn’t be good to use for my pond wiring system?

Can I use this box to protect an “indoor only” adaptor outside? It’s for a small water mister that is for “indoor use”, but I want to use it outside.