We know that the judge who signed the warrant was a Trump appointee, and that he has requested the warrant be unsealed by Aug 15. We also know that the reason the FBI was made aware of additional documents not being willingly returned was that someone in Trump's inner circle turned informer. The fact that someone was privy to the knowledge of what had been kept and informed the FBI of it after the Archives had previously picked up 15 boxes, basically blows a hole in any claim that Trump was unaware of the fact that he was committing an unlawful act.
You'll notice none of the denials focus on claiming there were NO classified documents seized, and both the warrant and the list of seized materials are in Trump's possession and could be released by him at any time. And as has been pointed out, the FBI chose Monday because it was just outside the 90 day threshold (92 days) prior to the midterms. The irony is that while many people are attempting to mindlessly complain about the FBI engaging in "political tactics", the exact opposite is true.
The FBI actually went out of their way to avoid violating Trump's privacy or to prejudice his public image. The primary example of that is the fact that they did not even announce the raid or acknowledge that it had occurred. That info was released by Trump, and he decided to do so long after the raid actually concluded, mainly to portray himself as victim. There were no news crews on site that had been alerted by the FBI. As far as the FBI was concerned it was a secret operation...
They purposely chose a day when he was not at the site, to avoid any pics or videos from news reports showing him being present and confronted by FBI agents. Basically the opposite of a perp walk, although they never intended to arrest him or put him in any handcuffs. They also dressed in plainclothes (not the usual FBI jackets) to avoid any type of photos which might possibly display prejudice against him. Reports are that the decision makers at the FBI deliberated for weeks over the pros and cons of staging the raid, after they received the info from the informant.