If the piece is complete vs just scketch or fragmenin manuscript or if total credit to Beethoven not established , then the published works of a complete works recordings would be the first place to look. You might pay for access to n m l, that is likey if available at all to Be where it resides. Ie
Nml would access this
https://www.arkivmusic.com/classical/album.jsp?album_id=2292995It is possible if available region license restriction to t a certain album may exist .
If that doesn't work try contacting a library ,. Research associate or inter library lending specialist should be able to check, worldcat.org, if you're adeptnat searching it may yield further results
Beyond that you might consult Grove music , there may be a write up on it there .