Let me lay out a scenario. I am the manufacturing manager for a small plastic injection molding company. I have several machines, and 4 operators who do the actual setup, mold and inspect. I create a setup sheet for each molder. I then save the file on the computer, in a shared directory that only I and the owner of the company can write to.
The operators print out a copy of the setup sheet with every setup, and fill it in. The printout then is added to the job file along with the other job documents. To prevent folks from printing out quantities in advance, there is a print date field in the footer. I will check the print date with the run date to ensure they printed the same date they ran.
So, you are an auditor and you ask for me for evidence I approved the setup sheet. My answer would be that if I had not approved it, it would not be there. If the owner put it there, she and I would have a talk about it before it was put in the directory. If you ask her, she would tell you basically the same thing. No one else but her and I could have put it there.
Why, oh why would you need some form of document stating that I approved it? It makes no sense, and it detracts from the effectiveness of the system. The more useless rules you place on your QMS, the more resistance you will have and the less likely folks are to follow the rules you do need followed!