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I also got 2 covers with my recent 993 purchase. It used to have a turbo spoiler which I removed so I think I have the cover for the spoiler model available if you need it. Haven't actually taken them out of the bag yet to inspect.
I have never put covers on any of my cars. I just made sure they were washed and waxed before putting in storage. Although, this year I'm considering this (no affiliation): http://www.carcapsule.com/