I pulled over to check my map near dusk on the evening of February 26th. Near the car was a plain-looking mailbox in a cinder-block box partly filled with dirt. The post looked special, though, as if it had a faded design painted on it:
Sure enough, the design was some kind of climbing vine. I'm guessing that the post had a vine, or the cinder-block box used to hold some kind of plants.
Clever idea, eh?