Do you really think Merrick Garland and Christopher Wray wanted to have to chase Trump down to get classified information?
I haven't seen the warrant but if what I've read is accurate, Trump was given an opportunity to turn over missing records that he (probably illegally) took to Mar-a-Lago. He would have signed paperwork to that effect and submitted it through his lawyers to the National Archives. If they retrieved boxes upon boxes of classified materials after the fact - which seems to be the case - then he signed and submitted a false sworn statement to federal authority - a likely felony in and of itself. Having classified materials in his possession after having declared that he turned them over is also likely a felony - ironically because Trump made 'mishandling' classified materials, which used to be a misdemeanor, felony.
They didn't even have to give Trump the courtesy of giving him time to submit those documents. Merely possessing classified information in an unsecured area is basically a crime ipso facto. They gave him chances to not be a criminal.