Actually, divers recovered them in 2014 to augment a digital reconstruction of the typeface: https://typespec.co.uk/doves-type/
> Fearing it's use in shoddy printing and undesirable subject matter [Cobden-Sanderson] took the entire fund to Hammersmith Bridge and threw it in the Thames.
If after 100 years it is now for sale it feels a bit sad. I hope it is used well.