I was once assigned to a group that did audits of cash tills for a retail unit. It was not our favorite task.
We would show up unannounced and perform a "cutoff" freezing both the paperwork, and all of the funds until we could get an accurate count.
One fellow was asked to roll the coins. He did a mighty proud job and we had coin rolls of all different lengths and amount.
Only later did we realize what else he had not done. He had been asked to seal a certain safe to be counted later. The seal was to have his dated signature that the safe could not be opened without detection. Normally this seal is attached at the door's edge.
When we went for lunch, the team leader looked around and noted that one safe had not been sealed. No boss!, I sealed it! Looking closer there was the seal stuck to the very front of the door.
It was the last time he was asked to do audits. Dumb like a fox, maybe?