And, Trump is much more likely to find a way to make money off of this issue than to spend money on this issue. It's more likely that he will find a way to collect donations to pursue the matter. He won't be spending much of his own money on a presidential election, either.
Let Trump be Trump.
If Trump wants to be Trump, he could start a new TV reality show...all centered on chasing down the missing docs, getting docs checked for authenticity, etc. Half the country would tune in and the WH would be yapping non-stop.
Great garbage TV, but with a good purpose.