Is it safe to assume the pin was not covered with a blanket or cardboard to protect it from sun/heat.

Out here in Arizona I basically won’t even move pins during the day in the summertime unless they are totally wrapped up. Underneath the glass, the play field will heat up like a convection oven unless it’s covered. It will warp the hell out of plastics, ramps, decals etc.
Same goes for cabinets with new decals.
If it gets really hot they will bubble up and ruin the art.