As with most hings smoking related wood moisture is a personal decision. Folks will swear by} __% is ideal."
Personally I have used everything from fresh off the tree to, been under my work bench for a few years. If you have doubts, toss a chunk in and fire up the smoker. How does it look and smell? If you find it unfavorable pick something else.
It's an electric smoker, not a lot involved in getting a sample of smoke rolling. Good Luck with it.