All I can say is if it anything like deregistering a car you're in deep sh1t.
I relocated from Italy to Switzerland in 2001 taking my car with me. Completed the Swiss registration in a matter of minutes once I had the correct paperwork, but the Italians wanted me to drive the car back to Milan with it's new Swiss plates on as proof that I had re-registered it. The Swiss registration documentation was apparently not sufficient evidence.
The Italian consulate couldn't be bothered to help me (I'm neither Italian or Swiss!!) so I simply threw the plates in the back of a cupboard and am ignoring it rather than take a week off work and jump through the bloody hoops Italian beaurocracy laid out infront of me.
I know there'll come after me someday, but knowing Italy they won't realise I haven't paid the roadtax until 2008 and by that time I'll be long gone.
Whooaahh!!!