Max Steiner, The Caine Mutiny
This is essentially half soundtrack and half dialogue recording. It got scrapped after Herman Wouk wanted to sue if they released it since they recorded his novel word for word. Columbia promised to destroy all copies, but a couple got past them. One such copy had been sold for $6.7k in 2007.

Max Steiner, The Caine Mutiny
Sex Pistols, God Save the Queen (1977)
There are 25,000 copies of this single, although only 10 survived after A&M destroyed them. The band members terrorized them so much that they got dropped only six days later. The label had to let go of the punks after they disrespected executives and ruined property at HQ. Some employees filched copies before they were destroyed. If you have the album with the A&M label, you might make $8,600 with it.

Sex Pistols, God Save the Queen (1977)