David Aber says that the bird on the box is “probably a Northern Cardinal that has faded over time.
It still has the black mask that distinguishes it from the Pyrrhuloxia.” (If you're curious, try an Image search on Bing, DuckDuckGo, or Google.)
He flew by on February 26th… actually, he wrote, “I was taking photos of an 8 ft. tall armored knight and almost walked into this mailbox.”
Thanks, as always, Dave.