Well usually when i travel back and forth we just make sure that there no obvious fans or feathers showing in the vehicle, n dont say anything.
Once we got stopped, i guess they thought stopping a van load if ndns, would produce some amount of alcohol or infractions against the law, but after a while they found that we were clean. We asked them what they thought about transporting eagle feathers across the border and they said it was fine, they had no problem with it at all.
I flew from canada to the states, at the time i didnt have a bustle, container so it was in a clear plastic bag and it was my carry on. The customs there didnt say anything in fact they just made me show it to them cause they wanted to see it. So i complied, and went on my way with no problems at all.
But i guess worst case scenario you could get some redneck or a jerk, and he could confescate them on you but i think that the governments are more culturally sensitive in this day in age, trying to maintain a good
PR.
Matthew