If the universe is really as empty as we’re seeing it and these UAPs exist as we’re being asked to believe in them then you’ll only know when whatever is control allows you to know.
As I cope with the above reality I’m finding it hard to engage in discussions like this I used to gravitate towards. Even if I only believe there’s a 1% chance of it being true, the implications of that reality just makes my brain stop after a lifelong journey of consuming the natural world and all it represents in scientific form.