Probes from Aliens

I have this funny idea for all of the people that think aliens might visit Earth. Wouldn't their satellites or probes have passed by long before? Like how we sent Voyager and others decades before space travel.

Of course that is not to say that the alien probes didn't sail by Earth back with the dinosaurs.

It's not funny, and why would they send probes if they know we are here, and I don't really think they are extraterrestrials, they probably came from Earth in the first place.

Seems like you are assuming they will be discovered.
I don't really see how the knowledge of alien technology could have been perceived without knowledge about the aliens themselves or at least their existence.
Even then there is still the uncertainty element saying what about some other aliens with different technology. We don't have to know about it for it to exist :/

Nope.