about the slip: On the backside, below the "peaceville" print, do you only have "1999" printed, or does the sentence "2000 Peaceville records" also appear?
Cause they should have both dates. Otherwise, it's mighty strange.
Chaveta: Slipcase, digipack, jewelcase - they are all defining the packaging of the CD, and has nothing to do with whats on the actual CD. But most often, a digi version has a more unlimited jewel case-brother.
Again, the digipack is made of cardboard and slipcase is a jewel inside a cardboard sleeve.