Just like Master System received the Purple Editions and Mega Drive received certain variants with Mega Drive covers but Genesis carts and manuals (no comments...) and the warranty sticker directly printed in the official cover, Dreamcast also received these little bundles. I believe these weren't available in other countries or if they were then they're extremely scarce and I have not been able to target but a few of them.
The one I recently bought is Crazy Taxi + Controller bundle with themed sleeve. The only thing that provides some exclusivity to these bundles is actually the sleeve. So far I got Crazy Taxi, Virtua Tennis and Another one with just a sticker and the game Rainbow Six included. I know there are others such as the Sega Rally and Space Channel 5 bundles but I am yet to find out more. These were available very cheap when stores decided to get rid of the DC stuff after it died but unfortunately I totally ignored them and now they're much harder to find.