A couple years ago I shipped a similar crate via the tractor guys, but my customer in England made all the arrangements (He really wanted the Hendey Taper attachment and parts)
Apparently the antique tractor network has a somewhat regular occurrence of machines going one way of the other in container loads. There's lots of nooks and crannies among the engines and tractors that will accommodate other crates of tooling. A strapping young guy showed up at my shop picked my crate up and juggled it around his shoulder with one hand while shaking mine with the other, and loaded it in his truck. 6 weeks or a couple months later it was reported received in England. The buyer had been willing to do bank transfers, cc, or etc. But I was basically getting an old Hendey off my conscience and the parts were not in great shape, so I wanted him to receive and verify them before paying. I told him to pay another friend of mine in England, and a bit later in the year, the money came in US bills tucked in with some micrometers, indicators, and other tooling the friend sent to me as a gift, via regular mail.
Dunno how to find them, maybe try Smokestack?
smt