When you describe it in more complete realistic terms, it's much less "convenient" and far more common sense.
We both know that presidents and vice presidents work with loads of classified information throughout their tenure. 10 documents winding up in the wrong place isn't surprising. In fact, it's such a small slight that no one noticed. That's far different than Trump's situation where the quantity of documents was so substantial, that NARA definitely noticed right away and that started the entire process.
And we knew about this long ago. There were stories published revealing this issue back in early 2022, but it barely made a ripple. When the search warranted was executed in August, people were genuinely surprised when they discovered that it related to the classified documents because they thought so little of the issue. This goes to show that it's not a "convenient" standard, but one that history confirms.