it makes it stateside. it's a strange bottle in that it's not especially rare, but there's really only two kinds of people that have it:
1) real lambic heads that know exactly what they have and are purposely aging it for flavour development for a long time. without a stupid offer, you're not likely to pry it from these people.
2) people who saw 'hey, a cantillon!' and pick it up, expecting to pull whales. i would expect GCB to actually trade from these people for something like HF growlers, or, really, anything a 'shelf' loon trades for.