The stamp on the SE cover has been perforated on all four sides, while a coil stamp is only perforated on two opposite sides (top and bottom or left and right).
A lot of people complained about the special edition cover, but I'm thinking that the special edition packaging might be constructed like an envelope and that maybe it's going to be quite an imaginative piece of packaging on the whole. We'll see I guess.
What does the 6867 mean?
02.06.2008 (June the second) is the date the album is sent to the stores. If you interpreted the date in an American-British way, it would be February the sixth. This could be the date the cover was designed. Double meaning?!?!?!?!?!?
And the 09 on the stamp tells that it's the ninth album. But I don't get the 6867....