Some people like to say there's no evidence of anything, but it's just that they refuse to accept the evidence or testimony of those who've seen these things.
It's the same faulty mindset as those throughout history who refused to accept new evidence, concepts and theories that turned out to be true. Our civilization advances in spite of those people.
However, the white "tic tac" UFOs and the developments since then have been really interesting.
The intriguing aspect of those craft is they were not detectible until we were close enough to see them or get them on short range radar. It is suspected that they use an advanced gravity engine and that they are probably unmanned drones collecting data, but what do we know. At least that concept is relatable for us.