I believe that a forensic anthropologist can accurately if not get very close in detail to exactly what humans have done in the past. It is more than just looking at the humans and studying them but understanding all the elements that were occurring at the time and better analyzing how a human would react in that situation.
It is wonderful that the discipline of forensic anthropology exists to give us an updated view of history and how we evolved as the human species. Unfortunately, though, there is no such thing as one hundred percent accuracy in such matters, and there will still be a lot of speculation about a particular item or activity.
Some things are just inherently impossible to know if they have taken place so far into the past. Forensic anthropology can enlighten people seriously in many regards, especially in relation to physical wounds and evidence, and even poisons or ingested substances. There will always be some things that are not known.
Forensic anthropology can not accurately determine in detail what humans did in the past. Humans are very complex creatures and forensic anthropology can only give brief descriptions on how they lived. It can not be thought of as accurate because there really is no way to know what someone did that long ago.
I do not believe that forensic anthropology can accurately determine, in detail, what humans did in the past. I believe it possess the ability to come very close, but the best I feel we can get is a very educated guess. Humans do a lot of things in any given day, some of our acts come naturally to a process and we leave evidence of that, however our free will also allows us to do unnecessary things as well and some of our activities leave no trace of evidence at all.