Definitions
1.Verbsimple past and past participle of box
2.AdjectivePacked into a box or boxes."The books are boxed, ready for shipping."
3.AdjectiveIn bridge and other card games if the cards in a pack are reversed face-up and face-down then the pack is said to be boxed.
4.AdjectiveOf domesticated animals, discrete flocks or herds having become mixed, either accidentally or deliberately. (Aust. OED)