Nice! I've still never seen a G&W for sale in the wild (knew a vendor who displayed his personal collection in-store), and you got a better Turbo deal than my bare-bones $15 find last week. Like you said though: just about anything Turbo you see in the wild is a deal!
Like yours, mine was missing the back cover but mine didn't even have a case for Keith Courage, much less, a multitap, second controller, extra games, etc. I had to find the few things it did come with (original AC/RF) by digging around the vendor's booth. Enjoy your Turbo. Here's hoping that the Turbo Everdrive will be cheap this Black Friday!