The plastic box wasn't the problem. It's the people working TSA. Left Vegas no problem, Billings it's a problem. Even had TSA in Billings ask if our bows were unloaded! Just my experience.
Only problem I ever had was not having it in the factory packaging. Leaving Montana with one less round. TSA came and got me at the gate. I told them they could have the others because I wasn't missing my flight. No more plastic ammo boxes for reloads!