WASHINGTON, DC - JUNE 24: (L to R) Allen Kane, Director of the National Postal Museum, Sharon Cohen, Executive Vice President, Partnership Marketing, Nickelodeon, and Chris Karpenko, Executive Director, Brand Marketing, United States Postal Service, induct the SpongeBob Mailbox into the Smithsonian National Postal Museum on June 24, 2016 in Washington, DC. (Photo by Paul Morigi/Getty Images for Nickelodeon)