Harmonica 4-piece set: Miyata, Suzuki, harmonica instruction book, cassette tape set

This is a set of four harmonicas, two harmonica performance cassette tapes, and a harmonica instruction book, likely purchased online.
The harmonicas include two Suzuki and two Miyata, for a total of four.
The instruction book contains sheet music and playing techniques.
Due to their age and possibly poor storage, there are some stains as shown in the 14th photo.
We have not been able to confirm the audio quality of the cassette tapes as we do not have a cassette deck.
We ask that only those who are not concerned about minor details purchase this item.