Finally got the drum back. It had to go to the east coast to be zapped. Seems to be OK but all the plastic fittings on the carrybag have become very brittle due to the radiation.
I also asked about a letter or some form of 'passport' so I could take it with me on future trips. I was told that they no longer issued these and I would have to get a temporary export/import licence, or pay again for more irradiation.
Bloody silly if you ask me...