Calligraphy Shikishi Paper, Karuta Size, 90 Sheets, Hyakunin Isshu [For Practice]

Calligraphy Shikishi (Colored Paper) - Karuta Size
Set of 90 sheets (10 sheets x 9 packs)

I am listing these items to help a relative declutter their belongings. They have enjoyed calligraphy for a long time.
The items were stored for a long time without the lid of the box shown in the 3rd image.
There are stains from storage as shown in images 4-6. Also, I have not removed the band to inspect each sheet individually, so there may be other age-related stains.
Please only purchase if you understand and accept this beforehand.
There is a small corner fold as shown in image 7.
Considering the condition described above, would these be suitable for practice?
The items will be removed from the pictured box and shipped as the product only.