i tend to agree with Dayle. i have new fabric that is over 10 years old- it has never been (used) some of it has been pre-washed though-
the seller should certainly mention in their listing that it is pre-washed- some people believe you should always pre-wash and fabric before using it- selling it-swapping it- someone may have told this seller that= she may have just thought it was 'the norm' you should contact them and tell them that it is a fact that should be mentioned in their listing- but to me- if the fabric has not been used-it's still new- pre-washed or not