I was looking at my screenshots of the tip-offs I've been to (all two of them) and noticed that the first one I found isn't listed here on in the official thread yet.
Pegasi Sector IR-W D1-90 2
-22.88, -161.85 (approx)
It was a large crash site with a wrecked Anaconda, a wrecked Asp Explorer, and a number of cargo canisters strewn about. I don't have a screenshot of the message from the data core, but as I recall it was the "hazardous cargo aboard" one. This led me to expect a UA among the cargo, but I wasn't able to find one.
This was around when 2.1 first came out. I'm not sure if it's still there now but I thought I might as well post it in case anyone wants to take a look.