Yes open box means it could come with little or no accessories. It is possible to have no battery, or cord.
Some people have very good luck with open box, my friend got an amazing deal on a Rampage 3 extreme and never looked back. Came with most of the accessories. However I also know of people that get items open box that don't work right.
You're taking a gamble. Re-certified is better than open box in my opinion.