I've said this before, but I'll say it again....
I don't collect these modern day cd-r promos because they are easy to fake. I used to work at Capitol Records in LA and if I needed more, say Coldplay promos, I'd simply email a request to a guy on the first floor who would burn them for me and print the sleeves out on his printer. They would be on my desk by noon.
I'm not trying to be a jerk and rain on your parade but just know that any of you, were you so inclined, could be in the cd-r promo business by this evening if you'd like. Keep that in mind when you pay so much for these things.