For the exports that expired, does that mean you can't buy the export anymore even if you had the manual code?
I don't remember what it was for, really, if that's even how it worked but I think I have an extra disc copy I might give to someone if it would still be possible.
I did all the exports for myself ages ago, so I don't remember the logistics.
RB1: You buy a separate export key from the store and use it in-game to extract the songs to the hard drive. For RB4 all you'll need is that export key, which is no longer available for purchase.
RB2: The back of the manual contains a code which was used in the store as access to 20 free songs (expired) and in the RB3 store to access the purchase of the export. That has also expired.
RB3: If you've played RB3 online it should be available to access through the RB4 store. This is still available, naturally.
LRB: The manual has a code which when used in the console store downloads a key. That key is used in LRB which is used to purchase the export. The code on the back of the manual to get the key no longer works, however last time I checked if you're on a console with the key downloaded you can still purchase the export for another account. Last time I checked this was a few months ago on a UK PS3, so your milage may vary.
Track Packs: The back of the manual contains a code. Put it in the store, it'll work on the current gen consoles eventually.