Best bet would be to get in touch with the shul on the Upper West Side, they’re still mishpacha and might be able to point you in the right direction. I know most if not all of his albums are on Spotify for a few years already, so someone must still have access to the info. Shkoiach and good luck!
you can try reaching out directly to the carlebach shul on the upper west side. i know his albums have been on spotify for a few years so there must be somebody with access/info.
good luck!