Mailboxes

We are checking our mailboxes.

Tom and Mary didn't check their mailboxes.

They didn't check their mailboxes.

Most of the time nowadays, travelers only know they have crossed from one side to the other of the partitioned island because of the difference in the color of the mailboxes or because road signs in the south use kilometers, while in the north they’re indicated in miles.

In apartment buildings, mailboxes are sometimes overflowing with ads and letters never claimed.