I am a random nobody and I was able to waltz in to my congresswoman's office. Obviously I wasn't digging through the desk drawers, but it's not like I was closely observed while I waited for my congresswoman's secretary to get off her phone call
I once saw a citizen with a 6-shooter strapped to his hip at a Colorado county clerk's office peacefully fill out some paperwork for 5 minutes. What does this story tell us about what rioters did or didn't do while tearing up the capital building?
1 minute of Googling tells me that Colorado is an open-carry state, and there is no specific exclusion for county offices, so unless this was in Denver or another municipality that prohibits open carry I don't see the relevance of your story to what happened in the Capitol.