Sometimes if a recording was not very popular, there may just not have been that many copies made. And if it was popular, copies from that era in specific formats are still pretty few and far between. It is entirely possible, probable even, that what you seek simply does not exist and if it does, it is probably in somebody's basement, garage, attic or collection. We are only able to find what is for sale. If there is not a copy for sale listed somewhere on the internet, we unfortunately can not do magic and make one appear.
If you have accidentally broke the only copy in existence, I am so very sorry. I actually did that once decades ago and it is a pretty heart wrenching experience.
I would like to encourage you that JustAnswer is indeed a legitimate Question and Answer Website and that our experts here are of the highest caliber. It's just that sometimes the answer we come up for you with such as "I am sorry, however there is no copy of the recording you seek listed for sale at this point within any of the far reaching data bases available to us" is sometimes not the answer our customer wants to hear. That is unfortunate, but no reason to get angry with JustAnswer.
I myself have searched available archives and have also unfortunately, for the moment, come up empty handed )-:
All that said, Let me know and I will not send your question to customer service for refund processing as you have requested. If you close this question however, on the remote chance that one of the emails I have sent to archivists and vintage record dealers on your behalf comes back that we have struck Gold, I will have no way to let you know.
It is your decision. I will proceed accordingly upon hearing back from you.
I would also like to open this question to any other expert who might actually be able to locate this for you. Martin, Cher, Tyler... ? Any takers?