I don't know that there ISN'T a von Neumann probe in our solar system. How would we know? The solar system is huge. The probe could be tiny. Again, how would we know? Have we tried communicating with it? Would it try to communicate with us? Or would it report to a nearby star, first, and await instructions delivered after centuries?
I've heard that the radio emissions from Earth are actually really, really weak, and distribute radially. Nobody can hear us out there.
The entire galaxy could be teeming with life, that's communicating point-to-point. Why waste energy in radial communication, when you can just draw a straight line from star to star?
Sometimes, I think, all we need to do, is point a big powerful laser at a nearby star, and request boot-procedure handshaking instructions, from the nearby access point, and then just wait for the signal that inevitably responds, with instructions on how to maintain the communications link.