Colo spaces that date back to the mainframe days are great places to
find Bus and Tag cables. The hard part is convincing the manager to
let you dig them out.
One time when I was doing a rescue, I was told I could take everything in
the racks, but not to try to pull out the ribbon cables that went under
the raised floor. Appareltny doing so was likely to raise clounds of dust
that would trigger the fire detectors.
Fortunately, they were just plain IDC ribbon cables so I wasn;t _too_
worried, Had they been anything rare, I might have tried to find a way to
do it.
-tony