Did you get any feedback on this? I don't really know if my point got across. I'll try again.
No lock tone in STT, seeker slaved to radar LOS:
If you cage the seeker, it will stay at it's current attitude, e.g. 20° right off boresight and level. You can roll the aircraft left and it will stay in its current attitude, now pointing up.
If you then reselect the AIM-9, the seeker returns to boresight.
With lock tone in STT, seeker slaved to radar LOS:
If you cage the seeker, it will move to boresight correctly.
I could not find any documentation saying that the seeker should go to almost random attitudes.
It's either slaved to the radar or at boresight.
I added another track. 9Xseekerboresight_2.trk