From the article you linked it sounds more like a vehicle used to transport the money during or immediately after the robbery was what led the police to them.

From the article you linked it sounds more like a vehicle used to transport the money during or immediately after the robbery was what led the police to them. "Despite the daring robbery, what ended up solving it was not that exciting: An informant identified Hill as the person who rented a 14-foot U-Haul truck a day before the heist and had returned it a day later."