Guaranteed, that affidavit WILL become public knowledge at some point in the foreseeable future. For now, only someone truly ignorant of how the judicial system actually operates and/or a GOP political propaganist would ever question such.
Unlike Trump - who uses total BS rhetoric to whip his base into a frenzy for self serving purposes, DOJ are mandated by law to follow legal protocals before ever disclosing and/or releasing any information regarding their investigations.
Knowing such, Trump fully expected the DOJ would be impotent in counteracting his rhetoric claims about a political witch hunt, etc, and that they'd never disclose any legal documents pertaining to the search warrrant (deliberately placed under seal in order to preserve & protect Trump's legal rights).
Remember, it was Trump - not the DOJ - that first disclosed Mar-a-Lago being searched in an effort to spin a narrative about being politically persecuted (and fund raise off that) when in reality, it was always about his own criminalities. He figured he had the upper hand against the DOJ in spinning a narrative beneficial to himself, knowing full well the latter are legally constrained in whatever they can disclose about any investigation.
He never anticipated DOJ would call his bluff and file a 'motion to unseal', which, need I remind you, was initially put in place to protect Trump's privacy and legal rights. Now he & all his corrupt allies are scrambling to come up with a new narrative their gullible followers will naively believe as to why Trump illegally absconded with Top Secret documents pertaining to the US's nuclear weapons when he left the WH.
For someone that has a GLOBAL reputation as being a purely monetary transactional individual with no moral compass, is it any wonder he's also now under investigation under the Espionage Act?