Should you fish out tenbou from the depths, do not attempt to play mahjong with them. They may be from what our scans have identified as 4P.
For further details refer to the following case file
https://files.catbox.moe/mdsace.png
https://files.catbox.moe/lyqzzl.png

An audio reading for visually impaired individuals has been provided.
https://files.catbox.moe/5t0zc5.mp3