[Dan Banquer]

Mosaic records has an 8 CD set of Elvin's Blue Note years. The remasters appear to be reasonably well done and the CD's are straight off the albums. This appears to be the real thing as far as I can tell, but you do have to remember that the material was recorded in the late 60's and early 70's.
http://www.mosaicrecords.com/prodinfo.asp?number=195-MD-CD

d.b.