I seriously doubt that anything could get out of the bags and breed beneath the surface, but it's just concievable, if the bags were well sealed, that some microbes could have survived inside the bags to the present day. If they managed to reproduce, even for a short while, the moon would be the first alien world on which we know life has been present and reproduced.

Mars has conditions that might allow a hibernating microbe to survive, but it's still doubtfull anything has managed to reproduce on the surface.

Any more details on the bags? It would be an interesting (if icky) target for a future moon mission to recover.