I am sure this is a possibility but any seizures in the future would likely result in auctions a few years down the road right. Doesn't it take that long for the process to play out?
The Australian government also has a bunch of seized coins (some 20'000?) that it plans to auction. And the Mt. Gox trustee still hasn't defined whether he can return the ~200'000 BTC as BTC, or will have to aution them for JPY.
(In fact, the Mt. Gox trustee is still trying to determine which of the former victims' claims are valid and which ones are bogus. It seems that some of them are quite outlandish...)