well i'm fairly certain there was an issue with the zep boys not donating any items to the hard rock museums which P O'd the management of the chain.........thus leading to the obscure placement of any zep items they do have (such as the zep mic and pics hidden by an obscure fire exit at the vegas hard rock)
childish to be sure.........but really.....the least they could do (zep) is provide a little something .even some old posters would do.....