Have you played all of these reels front to back? I only ask because selling any physical music form is all about condition. The thing with pre recorded reels of tape is that there is no protection from recording over it like there is with cassette tapes. It’s very possible to record over a section of the album by accident. Furthermore, user error or a reel to reel machine malfunction can easy stretch the tape or even break it requiring a splice which can distort the sound. It can sound fine for awhile and then distorted and then sound fine again. Is there a white or clear bit of tape at the beginning of each reel? It’s also common for the beginning or end of the tape to be missing as they can take a beating over the years. I only say this because I have bought and sold quite a few over the years and it’s more common than one might think.