Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4417136.

The door for my mailbox is currently on backorder with a 2 week minimum wait time. This print took about 4.5 hours at 0.4 resolution. Not perfect but gets the job done.

top center hole is for a screw to be used if the door doesn't stay closed, middle hole for the handle, I'm just using a screw and 2 printed nuts for mine.

Cut hinge tabs shorter if needed to fit.

Alt version allows for use of screws, this has the advantage of being stronger and also adjustable.