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During negotiations about the carved ivory tusk, Wu noted, “we will probably have some problems with customs”, adding that “this item is pretty sensitive”.

Rhino horns are considered status symbols and believed to have medicinal properties in parts of Asia. They are also carved into jewellery and household items including combs, buttons and belt buckles.

A carved rhino horn is among the confiscated wildlife contraband placed on display during the 2015 U.S.-China Strategic and Economic Dialogue in Washington, D.C.

In their senior year, the Hoang brothers founded Rhinoceros Horn LLC, which sought to make and sell a lab-grown version of the chief ingredient found in rhino horns — keratin. But they weren't alone.