I have performed two shops, both which took 4 hours. The first was the better organized and the tool drawer was in the parts department. I had the Service Manager's list with the missing but ordered tools. Some had been received. The second one was way less organized. However it was easier to do. I could see know knocking them down to 3 hours.
Pictures. The tool cabinet is high. I used a step ladder to get high enough to take pictures of tool drawers 1-5, then could do the rest standing on the floor. The pictures of the dealership equipment was not as hard as it first looked. However it may take some deft moving to get the model or serial numbers as the equipment may be around other equipment. Most offered to move equipment (except the bench lathe but the serial number was easy to get to). However at 60 I relish the chance to move in tight spaces and my goal is to impose as little on the employees as needed so I kneeled and got the numbers. Software updates were estimated or in the first one I forgot. It did not require returning and I received a 10.
How I Performed the audit. During the second audit, the employee who assisted me provided me with a booklet that had the part number and the drawer. For all the loose tools, it saved much time to locate the sheet.
I keep in mind that it may cost the dealership money if they have to order a missing tool. I made sure to match the part number to both the drawer and the list.
Do not read so much, look about you and think of what you see there.
Richard Feynman-- letter to Ashok Arora, 4 January 1967, published in Perfectly Reasonable Deviations from the Beaten Track (2005) p. 230