I'm not sure if there was an original slip cover, but this listing is just for the pins and the black box shown in the photos. The dimensions of the black box are 13.5x10.5x2 inches.
Each pin is approx 3-4 inches wide. See photo with ruler for size reference. Please note that the collector who this belonged to did have cats, and there was some cat hair that we tried our best to remove. I'm listing lots of great Star Wars collectibles for the holiday season, so make sure to check out my other auctions.