There are several larger sellers who do not specify which "era" their offerings are from, so when searching that era specifically, their listings are not found. I enjoy buying cards from these sellers because of the better prices due to fewer eyes on their offerings.
Outside of 12 hours remaining on the auction, there are no fees to cancel.
http://pages.ebay.com/help/sell/end_...l#requirements
I would end and relist in proper era.