 As word of this manoeuvre became known to the public, owners of the altered cover attempted, usually unsuccessfully, to peel off the pasted-over cover, hoping to reveal the original image hidden beneath.Eventually, the soaring value and desirability of unpasted-over 'butcher covers' spurred the development of intricate and complex techniques for peeling the 'trunk cover' off in such a way that only faint horizontal glue lines remained on the original cover.Copies that have never had the white cover pasted onto them, known as "first state" covers, are very rare and command the highest prices.