Reminds me of a cartoon I once saw. All these tough guys around a table, a garden gnome in the centre. They're cutting letters out of a newspaper to form a message. 'We got your gnome.' Oh, shit. Do you have garden gnomes in the US of A? I bet you do, and lots more besides.
We have the Travelocity roaming gnome, who seems to have a self-destructive streak...at least in the TV ads I've seen. And there are lots of gnomes at a tourist attraction called Rock City.
This may tell you more about me than you want to know, but if I received a note saying, "We have your gnome," I would not be moved to action, most probably because I don't actually have a gnome and would assume the note had been delivered to me by mistake.
Charlie Kaufman is the only one who could possibly figure this out, although Philip K. Dick would probably come in handy, too. Kaufman could take us through the secret portals into criminals' brains so we could know what they are planning, and Dick could help us identify which people were about to commit heists even before they knew they were going to commit them. That way we'd have all our bases covered.
Actually what I'd like to steal is some of Dick's ideas for short stories. But I guess that's not much of a heist. I like Jon's parameters...heavily guarded, inpenetrabe vaults and souped up Mini Coopers, although I personally would like to drive a souped up Maserati or Lamberghini. My partners in crime can have the Mini Coopers.
I was thinking the whole thing, but if you have something anatomically correct in mind, I suppose we could hit with a hacksaw.
For some strange reason I've always wanted to steal those gold statues of... what the hell was his name... John Smith? No, that's Pocahontas... Anyway, those gold statues on top of all the Mormon temples. Like all at the same time. A fleet of helicopters snagging each one in a massive coordinated effort.
Not that I have problems with Mormons. I just think it'd be funny.