I wrote:

Or, it might be that the investigators thought that a mere subpoena for records would be less explosive than one for documents.

That should read: Or, it might be that the investigators thought that a mere subpoena for records would be less explosive than one for key witnesses & testimony. And to anticipate questions in email,

This is not to say it was not on the minds of `the powers that be', which I will henceforth coin the PTB, and let it serve as the hypothetical TLA responsible for all *unsolved* conspiracies in existence.

TLA is a silly self-referential term: Three Letter Acronym.