Pet peeve of mine:
Listing something as NEW, but then either saying in the listing, or not mentioning it is USED. I use Ebay often, and when I narrow my search by certain criteria, it pisses me off when people do things like that. Personally, I won't bid on auctions like yours.
Once you open the package, it is open package new. Once you use it, it is used. No matter if you used it once, or 100 times. It's used.
Regardless, welcome to the forum and good luck on the sale.