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Huh? What does that have to do with this thread?

It would seem that the posts I quoted were not attached to my reply.

I was unable to empty my trash after deleting these files before turning off SIP, even after a reboot it would not empty because it said the files were in use. As soon as I had disabled SIP and restarted I was able to empty my trash and then switch SIP on again.
 
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Just as a data point, I was never on any of the betas.... so you may be onto something there. It does not seem like the rest of us are not having this issue.

I agree. I think it may have something to do with the betas. I think those who used the betas also have PreviousSystem folder.
 
I filed a bug report. Turning System Integrity Protection off or deleting the folder remotely via Recovery or a previous OS X install will do the trick.
 
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