The anchor was raised to the surface on January 6 and taken for forensic analysis, the National Bureau of Investigation said in a statement the following day.
The program dates back to 2019, and was first designed to gather import data on low value shipments from major retailers to better identify counterfeit goods.
Regular box services to Ukraine started in April when the Ukrainian transport and logistics firm Iteris Feeders launched a service between Constanta and Chornomorsk.
The tariffs are seen as a protective measure for the Mexican textile industry, and a way to reduce imports from China, potentially avoiding trade conflicts with the U.S.
Biden announced his decision following a lengthy national security review into the deal, led by the Committee on Foreign Investment in the United States.