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Not exactly similar, but FWIW:

The Feds (Treasury) took 8 years to bust Seagrams on various charges. Much of that time was spent by agents going over records in a locked room w/an armed guard at the door. My father was one of the agents inside the room.

This took place in Milwaukee, WI and I can't for the life of me recall the dates....70's, IIRC, but it could have been a bit earlier; I was already out of the family home and my father never discussed his cases much. I learned this bit from one of his collegues sometime in the 80's after they had both retired. Dad confirmed the timeline and the circumstances, but never revealed details or sources.