I have just gone through this appraisal process. I have a 40 year old archive of sound recordings that I did for my first documentary film project in the Appalachian Mountains with Bascom Lamar Lunsford back in 1964. I want to sell my archive to an individual who donates to the Library of Congress, who wanted desperately to have.
I had to find sound experts who is evaluated the archive from three perspectives.
number one -- what is its intrinsic value of it?
Number two-- What money could it make if copied for music CDs and DVDs?
Number three -- Are there other ancillary values that can be added?
I went to an expert in the music industry connected to Butterfield and the appraisal costs be $2000. It was well worth it.
If there is any more help that I can be, just e-mail me.