Every one of the 4,000 trace landing cases.
The wealth of evidence entered into court in the Cash Lundrum case. The government escaped on that score through it’s capacity to claim National Security and it’s success at lying in court.
NO. Look up your own links and refs, hotshot.
It could just as easily be inter dimensional visitors, time travelers, natural phenomena , or prank-playing teenagers. Any competent lawyer (IF the evidence ever made it into court) could plant reasonable doubt in several seconds.
Only your imagination makes the assumption that they were caused by beings from some other planet.