It shouldn't be too hard for an interested private citizen of means to set up a grid og drones that automatically land and recharge and constantly record everything, passing it to a computer system that looks for these enormous objects.

I'm sure if it was real and if we wanted to we could obtain decisive visual proof in a way where the public was convinced that was not fraudulent.

Like why should we be spending millions of dollars on seti when the corresponding search for these kind of things on earth should be a lot cheaper and easier.