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I would promptly check to make sure all the bolts holding the torque converter to the drive plate (flywheel) are present and accounted for. If one of them backed out and was rattling around inside the bell housing. It could have been the cause of the noise. You would not want to drive the car with one of them missing.
Otherwise, Jorell's theory of a stone getting in there via a vent opening (missing its plastic grill) sounds like a likely cause. In either case, the foreign object could have been moved when the car was put on the rollback, causing the noise to be gone when the mechanics looked at it.
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