If they are in original manufacturer's packaging (Intel, AMD), they are properly protected for long voyages, shipping and mishandling.
Just watch out about who you by them from, there are a lot of forgeries and mislabeled processors out there. There are reports of processors being labeled let's say Core2Quad and some low end Core2Duo was shipped. Only after installing it people found out about true model. Same with i7 but i3 was received.