That being said, I do thank you for your prompt replies. It's much appreciated!
Also missing from your list (and the AU/EU/UK PSN Store)... Green Day Pack 01 (it disappeared just before the release of Green Day Rock Band and hasn't been seen since... Green Day Pack 02 is still available, but the first pack is not).
And, apparently there are some Doors pro-upgrades missing also. I got them free in the first week, but it appears that the "Light My Fire" and "Touch Me" pro-upgrades have gone missing since then (& may wanna check on "Riders Of The Storm" too... just in case).