In A, Chopin wrote only two naturals in this place – before the 2nd quaver in bar 476 and before the bottom note of the 1st quaver in bar 477. The missing signs before the 1st octave in the L.H. in bar 476 are the only case in the entire fragment in which the first occurrence of a note in a bar was not marked correctly. It probably indicates that the part of the L.H. was written after the passages in the R.H., hence the first b Chopin encountered while writing was the 2nd quaver, written on the bottom stave. Considering that the 
is valid also for the topmost note in the L.H., all necessary naturals were added already in GE (→FE→EE).
Compare the passage in the sources»
category imprint: Interpretations within context; Differences between sources
issues: Accidentals in different octaves, GE revisions, Omission of current key accidentals, Errors of A
notation: Pitch