I read that Corsair
currently ships their boats in shipping containers from Vietnam
where they are made, so they definitely fit. I also read that Farrier's F33 & F32 will fit in a standard container. I remember seeing pics of one being put in a container. A tight squeeze, but it fits. Here's some links with pics of an F33 going into a container.
F-33 Texas bound
F-33 Florida Delivery
You would need to disassemble the beams from the floats tho. A search of the F-boats Yahoo forum or the Farrier website or even Corsair's will yield several examples.