Sentries can be placed at the grave.

I've had more than enough of you and your Jews to-day." Thus the Arimathean was dismissed, ungraciously, it is true, but with permission to bury the beloved corpse.
Meanwhile the torment of the two desert robbers had ended.

And Dismas was at last set free from Barabbas, to whom a demoniacal fate had chained him his whole life long.

Jesus had come between them, and had divided the penitent man from the impenitent.

It is true that their bodies were thrown into the same grave, but the soul of Dismas had found the appointed trysting-place.
As soon as the Arimathean returned from his interview with the Governor, late as the hour was, Jesus was unfastened from the cross and lowered to the ground with cloths.