It's easy to fake. The only hard part is making sure that no one involved spills the beans. The more people you bring in to help, the faster it goes, but the greater the risk you get exposed by a slip up or whistleblower. This way, with months to work with instead of days, they can prepare for the audit it with just a small number of people, get their stories straight, etc. The "tamper proof" seals for example can just be sealed after the fact as long as all parties that signed off are in on it, and so on.