first of all - i haven't seen over the last few days neither degraded emission USS Threat >3 nor encoded T >0, which means my and others info on rare salvage goods spawning in there might be outdated. Also i haven't seen any convoy Threat >4, even if i'm sure i have seen some before the last patch (but i might misremember). Threat 4 convoys are a relieable source of Hafnium 178, but i haven't found anything else in there.
This info though is top notch:
This works fine for me... as follows:
time capsules,
Earth relics, Algol system on a permanent signal source
AI relics, Medium security systems - interdict Private Courrier Vessels
space pioneer relics,
SAP8Core, War and Civil War systems - interdict Military Courrier Vessels
gene bank,
fossil remnants,
antique jewellery, Medium security systems - interdict Private Courrier Vessels
anti matter containment units, War and Civil War systems - interdict Military Courrier Vessels
trinkets of hidden fortune, Interdict random transport and small ships (Adders are the best)
These Military and Private Courrier vessels are kind of random... they seem to spawn often the more populated the system is... wait in supercruise for them.
I don't know any specifc location for the rest of the mats you're looking for.
Happy hunting!
Note:
- it is possible, to steal from Private Courier Vessels instead of attack, if you don't interdict them, but wait and follow their low wake.
- Medium security gives enough time until system security shows up, to empty them and collect. Be aware system security will somehow ignore cold or silent running (because "npc eyeballing", as a dev has one said, and because npcs always go for players first). which means, when system security shows up be ready to jump out.
- process is pretty similar to stealing from installations, megaships or getting Thargoid Tissues - running cold, silent running during hatchbreaker phase and after that, always staying out of autoresolve distance and break target lock if you got into autoresolve.
- same can be done with convoys. if you want to test it before having to deal with system security, take any convoy in an anarchy system to check the process.
- The only difference to installations, megaships (both are broken at the moment) and thargoids is you'll have to run enough hatchbreaker limpet controllers to overpower the point defence, and you need to run a grade hatchbreakers as to get the reload times low enough. I'm doing it either in a cobra, or in a DBE with 2 3A hatchbreakers and a 1b collector, but i'm sure dolphin would be as good, and AspE might be even better (can't comment on its autoresolve distance, which might be higher due to size).
So if you prefer playing sneaky instead of going in guns blaizing and full pips to shields, or if you don't have a wingmate around - as piracy is a great coop gameplay - that might be an interesting way to go about it (it is for me).