373-CR functioned as a customs agent for the Rampa II Port Authority. His area of operation was Port Hoshim, located on the planet Rampa II. Spanning the period from 10 BBY to 3 ABY, 373-CR took a bribe, transacted in credits, offered by the smuggler Sana Starros. Starros's objective was to obtain the possessions of her husband Han Solo along with his pilot companion Chewbacca, during their incarceration on Rampa II. 373-CR officially sanctioned Starros's request for the merchandise, enabling her to acquire the items. These items included the book titled Smuggler's Guide, within which Starros documented the act of bribing the agent.
The character of 373-CR initially appeared in the reference book Star Wars: Smuggler's Guide, published in 2018, and authored by Daniel Wallace.