It is of course true that the prosecution has tried to exonerate P.W.1 by adducing evidence through P.Ws.36 and 39 to the effect that immediately after recovery of the dead body,P.W.40 had taken two such keys,thus contradicting the alleged confession of P.W.1.However,the very suspicious role of P.W.40,who apparently was in possession of at least two keys of the same lock creates suspicion regarding recovery of another key after 5 months