One of the 'features' which I would expect to see in the XT pipeline would be what I call a 'forced spend'.  This would happen when black- or white-listing and individual identity systems were rolled in and proven.  A year or two.

A forced spend would be something like 'you have a year to dig out your deep storage wallet and send your coins to yourself (or whoever you choose) else they will no longer be valid.'  In this way the entire currency base would be known and a good starting point would be in place.  We are in an 'unfortunate' situation now where there are plenty of BTC which are not really understood by those nice people who are protecting us from terrorists and stuff.

The way this would effect Causius Coin (or whatever it was) would be that people would have to break the seal.  An alternative would probably be that the holder could produce them for physical inspection and registration.