alone the energy that would be radiated outwards by and FTL ship is a dead giveaway.
technically 7shotsolo is corect about it being hard to tarn a interstellar civilization from another interstellar civilization you know... even tho the scale of surveillance he suggests he has is ,let's say, incredibly hard to archive, it's hard to prevent interstellar crafts ,industrial planets ,and large structures of purified materials like steel,to be spotted from a civilisation that's on the lookout for them.
Don't worry, I'll just use this for infrastructure reasons.
the Zolypian Union probably does not do its job well, considering that the Strike Empire had unintentionally scanned the entire Laenean galaxy with state-of-the-art void scanners, and we now have predictors scanning and calculating every route and ship that travelled and will travel across this dominion you call your own...