"The fact we didn't unleash it to the media was because it was a breach of a code of conduct.
"The club made the decision.
"The board, the NRL's integrity unit, the coaching staff, the players, their managers were all told when the breaches went out."
Sutton was last month replaced by star fullback Greg Inglis as the club's captain, a decision Richardson said was unrelated to his code of conduct breach in the US.
Meanwhile, the NRL has reportedly asked the Rabbitohs to remove footage of centre Kirisome Auva'a, currently suspended after pleading guilty to domestic violence charges last year, from their membership video which aired during last week's Charity Shield.
- AAP