SETA has a hit?
Perhaps that ancient ET activity found in the Solar System will be a Bracewell probe? My favourite speculation - and that's all it is - is that ETIs presently live in the the Kuiper Belt or Beyond, using vast mirrors to warm up. They watch as like David Attenborough watches lions and meerkats, but with even more invisible technology than cameras hidden in remote-control crocodiles and elephant dung.