The shipment apparently contained a large amount of weapons, including machine guns, handguns and sniper guns.
Authorities raided the warehouse where the weapons were kept only to discover the guns were meant as props for the zombie movie, "World War Z," starring Pitt.
Counterterrorism officials said the guns were not properly deactivated and could have been used to fire live ammunition.
Janos Hajdu, head of Hungary's Counterterrorism Center, explained that in Hungary, weapons were considered to be deactivated only if the process "was irreversible," while the weapons seized could still be fired even though screws had been used to fill the end of the barrels.
The Associated Press contributed to this report.