Trump visited Mar a lagoon 134 times during his presidency. 26 boxes of documents were removed. A bankers box could hold three to five thousand pieces of paper with staples, file folders etc. 26x3000 is 78,000 pieces of paper. I have never seen any mention of Trump being A big reader. In fact, any manager depends on Trusted staff to summarize huge amounts of info. So your argument does not make sense to me.
Edited to add one argument by trump was Obama took millions of papers with him. National archives said all documents are in their possession as per the law. Presidential libraries are run and monitored by the archives for record compliance after they are built with private funds.