Just a tangential thought, but I can't imagine seizing Australian assets based in the US would make for a particularly comfortable diplomatic position to be in (although I suspect our current government doesn't care). To say nothing about the fact that we've already shown our hand (and upset most of our allies) by way of the Manning leaks, the Assange manhunt brought about largely by US political pressure, and, more recently, the NSA scandal.

I've mentioned it elsewhere but it's worth repeating here. Finding established case law dealing with foreign assets seized (possibly illegally) on US soil and the repercussions would make for an interesting exercise. I feel like there's one instance in particular that was especially noisome that happened recently, but I can't for the life of me remember what it was.

If you don't mind my asking, what contingencies do you have in place in the event of a seizure of hardware assets? It's unlikely, but the FBI has been known to take anything that vaguely looks like a server...