Regarding the 3.5" set above without rook stamps.
I agree this normally indicates some substitutions but a good look at the felts on those pieces will usually tell the tale.
I have seen various 'faults' on Jaques sets on very rare occasions (JAQUES JAQUES, stamped on the king instead of JAQUES LONDON so a miss on a rook stamp seems possible. However, missing the crown stamp on one white rook AND one black rook in the same set seems taking coincidence too far.
It sounds like the same logic as carrying a bomb onto a plane to keep you safe.
The chances of being on an aeroplane with a bomb on it are millions to one against.
The chances of getting on a plane with two bombs are so small that it is negligible. Therefore you are far safer carrying a bomb with you when you fly.
You could re-locate back the the UK Alan, perhaps Ipswich or Diss.
I think that would be best for everyone.
They tell me Diss has nice people...(thinking...)