Okay, so at the risk of drawing us in a full circle. @knowles2 is right - it's supposed to be pretty obvious, and I'm pretty sure we're all intelligent folks (not sure about Kerrash tho, right

) - so what is the simplest explanation?
The facts are on the wiki, of course but in terms of behaviour - it:
- Makes an alien/insectoid sound
- Taps out (or rather gurgles out), in Morse, the name of the local body or system, depending on proximity to the nearest body.
- Expires in line with all other dropped cargo, except it does have a unique animation for this (and sound)
- Does corrosive damage to the carrier's ship
- Can only be found being transported in human convoys
- The pilots in the convoy don't know what it is
- ...and don't appear to have been well-prepared for carrying it
-...and the places where these convoys are found doesn't seem to centre on any one particular area (does everyone agree with this?)
- Looks like it contains 'something' or a lot of 'something's
- Is surrounded by fairy-like sparks that move a bit like flies when viewed from a certain distance
- Causes visual distortion when viewed from a certain distance, specifically, it blurs the objects that are behind the UA from the observer's POV
So, again - ignoring all the tests that have been tried, all the theories that have been put forward. Based on this information alone, what *is* it? Most logical answers please - and let's see if we can't come up with next steps from that. If you'd humour a tired 'scientist'