Jupyter notebooks vanished

I installed Jupyter in a Docker container, accessed Jupyter through my browser on and everythings been running fine for a month until today when my Jupyter notebook crashed. I closed my browser and tried opening the server and it led me to a page asking to enter a token or a password. I entered a password in there and the server opened up but none of my notebooks are there, its completely empty.
The folder where Jupyter saves the notebooks locally in the container is empty too.
Also the token I was initially using to access the server doesn’t work, it throws an error saying the site can not be loaded.
How can I retrieve my notebooks?