The sting show is obviously setting up a situation in which the suspects who know they're breaking the law think the evidence is only in the hands of their co-conspirators who have the same incentive to conceal it as they do.

Major corporations know that their emails etc. are discoverable regardless of whether the recipient is trusted. It's also not even necessary to disclose the true intention to anyone else in the company, unlike a situation where they're trying to enter into an intrinsically illegal transaction with a third party. The manager can just come up with a rationale for closing the store all on her own and then tell everyone else that it's happening.