It’s so improbable that it’s pointless to bring up.
Improbability does not equate to impossibility.
The thing is, with regards to the universe and physics - (IMHO) we don't know, what we don't know.
Regardless, I've always had an uneasy feeling about sending up flares and declaring - 'hey, we're over here' - based upon nothing more but the hope of benevolence in whomever/whatever might hear it.