That question looks more like "how do coworkers tend to react to this?" than "am I going to get in trouble with management/HR if I do this?" to me. We have lots of questions about behavior in the workplace that could go either way. I tend to err on the side of leaving them open, personally. (I only skimmed this one quickly.)
If a question has been closed, those events occur in the post's edit history (example). So do reopen events.
You can see more history with the timeline. The UI doesn't provide a link for this, but you can see the timeline of a post by editing the post's URL from
(Replace "question" with "posts" and the title with "timeline".)
The timeline doesn't show votes, but it does show review tasks, including close and reopen reviews. See, for example, this timeline from a different question. So in addition to actual closures and reopenings in the edit history, you can see reviews that didn't change the state of the question.