No your not be over cautious.
That is a big stretch of water
, that can be huge and confused.
I'm no rigger by any means:
was 8 years old when I bought my boat and it had less than 3000 miles on it. It stranded on the lowers on the delivery
, we returned to Durban and I replaced all the wire.
Oh and the rig was inspected at survey
by a rigger........
I was curious , so I cut all the swages open it the angle grinder, it was shocking .
the rigging was professionally done and it wasn't over swaged. Just corrosion
I'd also take a good look at the pins, I would almost gaurentee that you'll find crevice corrosion
on 15 year old pins.
On a trip like that I'd also be asking how old the sails
But that's just me. I tend to be over cautious , The paranoia probably comes from 20 years of flying helicopters