snorkel box
n.— «He said the dropoff mailbox, or “snorkel box,” in post office parlance, will be located at the back of the parking lot near Foley Street.» —“Attention, Santa: all Bristol Postmaster Mike Parent wants before Christmas is a new parking lot” by Jackie Majerus Bristol Press (Conn.) Oct. 14, 2005. (source: Double-Tongued Dictionary)
Further reading
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There are eight major planets, but more than a million minor ones, including asteroids. If you discover one, you get the honor of naming it. The Dictionary of Minor Planet Names includes minor planets named for rock bands, jazz musicians, poets, and...