Imo the most likely scenario if it's true, is that these are automated von Neumann probes that traveled here without faster than light propulsion and that they'

Imo the most likely scenario if it's true, is that these are automated von Neumann probes that traveled here without faster than light propulsion and that they're here merely to explore, observe or possibly self-replicate. I believe this is the most likely option because it takes just one successful civilization in our galaxy, or even a close one, that employs this strategy. Crafts made deliberately to meet us would have to originate from much closer civilizations unless the civilization has both FTL travel and much more sensitive and high resolution observation technology than we currently believe possible. Supposing it is a von Neumann probe. There may be a planet or nearby system where these crafts are being built, but we're unlikely to be near the main star/region of the civilization. We might be stuck with just handful of these crafts for probably many (hundreds?) of thousands of years before any real first contact happens.