It feels like you are intentionally being obtuse so that you can retain your stance.
"Obstruction of justice" over getting what back exactly?
It's been spelled out for months (hell, years)...I'm not sure why you would even ask this question. The ONLY reason the FBI was brought into the Trump situation was because the National Archives requested they do so. Do you know why they requested the DoJ to get involved? Because if you don't, you really should read up on the issue before commenting further. But here's a hint: when the National Archives believes they need the help of the DoJ, that means someone has ****ed up royally.
Ironically, when Mar-A-Lago was raided, there were some on this site (maybe even you) who took the stance of "I hope this isn't all just to get some documents back"...If that was your stance, just think all that through for a moment.