The more pertinent question is whether people took and replaced the documents as disinformation; as well as whether they were allowed to be seen, copied, or otherwise checked out like a library by 3rd parties or used for extortion purposes (by anybody against anyone).
Biden had access to that material before Trump ever took office and certainly before he had any notion he would be Prez in 2021.
The "set-up" would be the discovery and its timing, not the placement.