[Boatanchors] Has anyone encountered "sabotage" while restoring/aligning R-388/51J-3's

[Lawrence Mayhew]

I am trying to finish up the last of my project Collins 51J-3 and R-388/URR
receivers, and of course I saved the ones that had not been "easy the first
time I worked on them" till last.
I have a couple that had very subtle disabling modifications done to them,
and I'm curious if any of you have experienced the same kind of thing.
One, a R-388/URR, had the filament lead to the 6AQ5 (audio amp.) carefully
severed and recovered with shrink fit tubing, and then hidden beneath the
power transformer. No chance this was anything other than intentional.
The other unit, a 51J-3, and a very nice "engraved" front panel in great
shape, had the slave coupler to the crystal switch loosened, the band switch
moved several steps, and then tightened again. Again, no way it just
slipped. I don't need to explain what a bitch this kind of devilishness
creates for the technician, especially when he is 70 years old.

The only thing I can imagine as a possible motive would be to get the unit
"surveyed" so that the saboteur could capture it in the subsequent surplus
sale.
Am I the only one who has seen this, or am I just the only one ornery enough
to keep at it till I found the problem?
Regards,..........Larry in Seattle