Officer Ratting?

Hello,
I’m looking for any recent information about officer rats.
Things I’ve seen have said they spawn in -0.8 to -1.0 or -0.7 to -1.0 but I first came across one in a -0.6 and got a 17bil drop from it.

Speculation around them seem to vary somewhat too, so I was wondering if any one had some good, up to date resources for how to find more of them.

I get that they’re incredibly rare but there’s a mechanic behind them right?

The only mechanics are that they can appear only in their respective pirate faction space and the lower the security status of a system, the higher the chances. Additionally, they should have a higher spawn chance in their respective NPC space.