I don’t know. I don’t think footage gets released unless someone leaks it, at least not at first. Costco better NOT be covering this up. They are likely going to have to pay big time anyway, and if they are exposed in a cover-up, it could be billions with a B in wrongful death penalties and lost business.
I LIKE Costco, but I would strongly consider cutting up my card if they try to sweep this under the rug.
If the footage cleared the cops, it would have been "leaked" already.
If it doesn't, it is very likely that it will be "lost".