Gentil et Bourdet glazed stoneware tiles ~160 count

I found these buried in a box at secondhand store, covered in newspaper from the 1950s. It was a curious find. We were going to use them as a kitchen back splash, but we don’t have enough. Upon closer inspection, we noticed the maker on the back was Gentil and Bourdet. I researched who they are and decided the tile may be valuable based on my findings. However, I could not find these exact tile anywhere by themselves, only on old buildings, in pools, or on fireplaces.
Most of them are in good condition. A few are broken in one or two pieces and some have niks on the sides.
Would anyone be able to tell me approximately how much these may be worth per tile, if anything? Each one is 3 1/8 by 3 1/8″.

Thank you