A former chairman of the right-wing Proud Boys group was sentenced on Tuesday to 22 years in prison for his role in the Jan. 6, 2021, assault on the U.S. Capitol by supporters of Donald Trump trying to overturn the former president's election defeat.
I imagine they would have to be part of the conspiracy to have planted them when they did otherwise it would be a really big coincidence. Also I am not 100% sure of everything that happened but it looks like they were planted at the DNC and RNC HQ’s so I don’t think they would have affected Congress. Also, from looking at some information from the FBI it looks like these devices were never intended to go off but instead possibly used for diversions.
It’s also possible they just never had a chance to use them as things didn’t go according to their plans that day.