I see your remark as a valid concern.
I was once in a situation where we did for fact have bad cops. We locked our home and vehicles always. We were not worried about theft or vandalism, we were worried the cops would plant something. We also had cameras set up. We knew several people targeted by them, their lives were miserable.
Considering how our federal justice system has has steered away from justice in favor of politics, someone mailing this guy evidence is not at all out of the question.
Being this guy was making his money on youtube videos which is very labor intensive. I doubt he had anything to do with drugs.
I would say it's very likely he is being set up.
Feds have no credibility. Not guilty.
I remember reading about bad cops in Chicago fifty eight years ago. After they were off shift, they would burgle homes.