If you go looking there are "credible" rumours. So-called "whistleblowers" or "SSP insiders" are videotaped on Gaia and other places to share their story. You can certainly find these if you look a bit. I trust the "whistleblowers" and "former insiders" less than thousands of random civilians who see things in the sky or have experiences tho. But your mileage or trust of different sources may vary and that's totally cool. Clearly something is going on.

I definitely agree we didn't simply "invent" this. If these are ours or we know how they work, we had to have help building them. Otherwise it's just too weird to consider an entirely parallel set of physical theories that tens of thousands of people must have learned and put into practice and it's not credibly in the open. There has to be something else stopping that from coming out, which to me implies secret cooperation with a civilization way beyond our own.