You can reach all the adventures, including the ones that had been archived at WotC by going here. This bypasses the front page and gives you the list of all adventures. Click each link and save the .zip file. I believe, but might be mistaken, that these are ALL the adventures ever released for LFR.
Kind of. Just look at the name - if the name says, XXXX3-Y where it might be NETH3-1, then that's the 1st mod of a year 3 series. NETH4-1 is the 1st mod of a year 4 series, NETH4-2 is 2nd mod of a year 4 series, and so on...
The ones that are 'unreleased' likely exist only as Microsoft Word documents (or whatever) on the authors' and/or writing directors' hard drives. Or perhaps in some forgotten cloud storage folder somewhere. In other words: not actually accessible to you unless you can track down those people.Trying to complete my adventures [...]
CALI 3-4 *is* CORE 1-16. They just re-named it and shoehorned it into the Calimshan region.CORE 1-16: Fragments of a Shattered Mind (released as CALI 3-4)