Great Until The Last Bit

Due to their being an estimated septillion stars in the observable universe and the total number significantly higher as it is just the number in the bit of universe we can see, the chances that the Earth is the only planet with life on it is madness and it is assumed alien civilisations do exist but we just haven't found them and by the same token, it is doubtful they have found us so they are not coming all this way to not say hello and just make patterns in wheat fields or stick a probe up the odd drunken rednecks backside.
What i assume also is that they are more advanced than us, we only came up with successfully leaving our Planet's gravity 70 years ago so they could have a massive start on us if we were busy hanging around in trees 6 million years ago and trying to not get getting eaten by a massive Dire Wolf when they managed it but a team of scientists from the UK, US, Sweden and India say they can prove that we are clever enough to track them down.
The international team of researchers have devised a way to search for extraterrestrial megastructures, known as Dyson spheres and say they have  identified seven of these huge things lurking in the Cosmos.
A Dyson sphere is a swarm of objects that orbits around a star to harness it's energy and the team say they have detected the technosignatures from these potential Dyson spheres.
Analysing data gathered by the European Space Agency’s Gaia map of stars, as well as the 2MASS infrared astronomical survey and NASA’s WISE infrared astronomy space telescope to carry out their work, they investigated around 5 million sources to build a catalogue of potential Dyson spheres and after sifting the possible wheat from the chaff: 'Have identified candidates that display anomalous infrared excesses that cannot be attributed to any known natural source of such radiation such as nebulae and background galaxies' the researchers say.
From five million down to seven and the researchers feel confident that these seven are legitimate but then, right at the end they add:  'We acknowledge that there could be other reasons why the group is emitting excess infrared and additional analyses are definitely necessary to unveil the true nature of these sources' which kinda punctures the rest of it.
Bloody spoilsport scientists with their caution and insistence on rigorous testing and peer-reviewing as they continually build up their knowledge of things over centuries and centuries.