Not explicitly no, but does it really make a difference if it's explicit? Given enough time our probes are bound to pass very close to some other star systems.

Not explicitly no, but does it really make a difference if it's explicit? Given enough time our probes are bound to pass very close to some other star systems. If there are other civilizations, it's likely that most of them would be on average 1 billion years older than us, as the average star is 1B older than our sun. That's a lot of time for a lot of probes to cross many star systems even just by accident.