There's Gold In The Mountains on the bootlegs "A Legendary Performer Volume 7" (Madison) and "From The Archives Volume 1" (Golden Archives), and Smokey Mountain Boy, Kissin' Cousins (Number 2) & Tender Feeling on the bootleg "A Legendary Performer Volume 6" laughably list what are supposed to be the 'Undubbed Masters'. As Elvis overdubbed his vocals to a pre-recorded backing track, it is not possible for these to be the 'Undubbed Masters', and are in fact just one channel removed (Stereo) from the original masters and then centred (Mono) so the songs sound as though the original backing vocals are not there! Fake!

This is purely a guess, but one of the unknown production numbers 2018 or 2022 may have been Elvis' vocal overdub to a completely different arrangement of Smokey Mountain Boy (Track 2012), but it is unsure if Elvis did a vocal overdub to this track.

In March of 2007, Sony decided to go through all of Elvis' masters. They retransferred everything and remastered all tracks including repairing as many clicks, pops, bad edits and dropouts as they could. They have used these newly mastered recordings on their new releases since 2007 including budget soundtracks, 'Legacy' releases, the 30 disc 'Complete Elvis Presley Masters' collection and the Franklin Mint package.