The cautionary accidentals before c1 in the L.H. were added in the L.H. in one of the last proofreadings of FE (→GE). They are also included in EE, apart from the 
missed in bar 5 in EE2 (the engraver of EE also omitted in bar 6, thus there are no accidentals on the entire stave of the 3rd great stave). This undoubtedly necessary addition probably comes from Chopin, although the signs are not to be found in any of the manuscripts.
Compare the passage in the sources »
category imprint: Differences between sources
issues: Cautionary accidentals, EE inaccuracies, Authentic corrections of FE
notation: Pitch