Afew "Sample" games, these were usually sent for promotional purposes or used in stores to show off upcoming games, they have an additional sticker and tesxt on the disc!
I'm amazed to see someone else with the Chocolat Maid Cafe "Curio"paperwork. While i don't really collect for the Mega Drive a nicely displayed collection is very impressive looking. Still think that era had some of the most vibrant and interesting art styles and since your collection is quite frankly pretty amazing what game has your favourite artwork for the system regardless of region?
I don't really know anything about Mega Drive collecting especially Pal stuff is the Oz Soft particularly hard to find or is it just because of the distance involved?
The only thing i know about that market is by all accounts the various distributors weren't that great. I remember reading something about massive delays for the Dreamcast then the launch didn't have any games to support it or something like that.