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Were you saving using snapshots, or the in-game save functions?

Worse case scenario, you can search the system for the save files.

find /home/pi/RetroPie -name "*ario*orld*.srm"

I use the wonky “*ario*orld*” search string because I don’t know exactly what the ROM file will be named, nor if “Mario” or “World” is uppercase, and wildcards will remedy that.