I wouldn't recommend putting it in a box. I've done that with 47 g5a twice and each time been fleeced by handling agents. Far more fun to fly!
However, if you must ... A 47g5a and probably all the models will go into a 40foot high top if you do the following......
Weld up some alloy tubes to make a mini set of skids. Same diameter as orig skids or close to. A local fabricator should do that for $500.
My 47 has a wet sump and I had to make the mini skids low enough to get the sump plug 3mm off the ground. Lift entire helicopter from jesus nut eye to remove skids. Fit your ground handling wheels to the mini skids using brackets from original skids. Easy!
Remove head with blades attached. Winch it tail first into the container. The mast will clear the container top with 3mm spare. Bolt skids down with angle brackets and coach bolts.
Detach blades and lay on carpet under the heli.
Easy peasy. Do pay for shipping insurance as containers do get dropped or lost overboard.
5 hour reassembly.