The only copy of the Wu-Tang Clan's coveted new album was seized at a U.S. airport on Sunday (01Mar15) after it was taken into the country in a locked security box with no key.

The hip-hop stars are set to sell the one-off copy of Once Upon A Time In Shaolin later this year (15), and it is expected to net the group millions of dollars.

However, the album's journey hit an unexpected roadblock on Sunday when the band's producer Cilvaringz took it into the U.S. from Morocco in a locked box, prompting a security scare at New York's John F. Kennedy International Airport.

The box was seized by customs officials and held for more than three hours as tests were carried out to confirm the contents.

Cilvaringz tells New York Post gossip column Page Six that he was eventually allowed to continue on his way with the rare item after officials at the Transportation Security Administration (Tsa) examined it with their "rarely used highest-strength scanner".