Regardless if you take it on the plane, or mail it home make sure that it is frozen and on dry ice. A military seabag is large and good for packing. Sometimes they think you are in the military and will not charge you the extra fee. As for the antlers, they will need to be mailed. Typically too big to take on a plane, and you know how they throw them bags around. Imagine what they would do to a nice set of horns or antlers.
If you want to borrow a sea bag let me know. I live just 5-6 miles South of You.
James