Make an Urban Mailbox Flag
Folks in the country have it so easy. They put up the flag up on their mailbox and the postal carrier takes their mail. In the city, you have to drop your mail in a corner box (which sits out on the street in the snow and rain, and the occasional evil soul uses for a trash bin) or you need to transport your mail to the post office itself.
I came up with an easy life hack by making a little tag asking my letter carrier to take my mail. It can be flipped in and out of the apartment lock box. I used ribbons threaded through the tag holder opening and made sure the tag hangs higher than the bottom of the box.