Crikey, I didn't expect you to have that many!
Dec is right in saying that there is no way of telling if they are from the same batch but you could still sell them if you explain the situation beforehand. 'Sold as seen' is the usual way of getting out of any comeback.
You could advertise them on ebay stating that they have no labels and that you can't guarantee they match and see what offers you get.
If it is the type of paper that can be used beneath a dado rail then you can often complete a wall with one roll and start a new roll for another wall. This means there would be no concern with pattern matching, only shading differences on sepeprate walls, which some people are willing to overlook.
Just make sure you are not handling stolen goods!