No,you sue the *LVPD* to hear the tapes.You sue *COSTCO* to see a memo that proves that they know there was only 12 ounces of shampoo in bottles that said 16 but sold them anyway.
Costco has *no* control over what happens with a recording made by the LVPD.Yes,you can call Costco employees as witnesses regarding what was reported to the cops by their staff but you don't *sue* them.
He didnt say sue Costco because of the tapes. You bring Costco in for a number of reasons, the principal being that is was initiated by their employees and on their property. Once sued, discovery allows for all documents, media, etc., considered material to the case.