RROP States
'An extra effort shall be made to retrieve cards that were folded as a result of mis-information' I would do my best in this instance to retrieve the players hand to award the pot to them, otherwise the pot would have to go to player A. Player A shall receive a penalty for mis-calling their hand after the pot has been awarded.
Splitting the pot is not in the best interests of the game, it would really have to go to one player in this situation, in order to minimise the risk of collusion, I can understand you wanting to do that but for me splitting the pot is not an option, one thing I tell TD's is think of the tourney overall and not the hand itself as the overriding consideration between the two.
Regards
Stuart