That was an interesting watch, thanks for doing this and sharing it!
But I cant help but feel you spent quite a bit of time (and money) and not getting a whole lot of result for it. It might be worth thinking this over in case you or anyone else ever intends to try something similar.
Thinking out loud here, for any way to get more access to their building, without endangering yourself; maybe hire someone to hand out promotional (booby trapped) USB sticks at the entrance of the building when a shift starts? Then hope someone inserts it in their office PC? Fly a drone, and land a USB stick on their roof where they smoke ?
Or, send them a stinky glitter bomb / camera thing like Mark Rober's infamous video: https://www.youtube.com/watch?v=xoxhDk-hwuo
You might not even need to travel there, although one would need sim cards that work locally and batteries and timing might be problematic if you send it from far.
Like I said, just thinking out loud for visit V2 :)