What I find interesting is that the tape was destroyed into tons of tiny little pieces, and then disposed of by putting piece after tiny little piece in waste bins scattered all over the building. HELLOO?? It wasn't enough to toss it in the trash, it first had to be shredded, ...and then those shreds had to be scattered all over the building? And no one wants to question anyone about that?
I'm surprised the guy didn't first burn it, then get into his car and scatter the ashes one 1/2 teaspoon every 500 miles to really makes sure it was completely destroyed.
What on earth could have spooked him so badly that he would react like that?

Those look like some memoirs that might be worth reading.