Hi Gerard,
I know you asked specifically re _OLD boxwood and I don't know where
your's lurked for a century, but I do know that English Boxwood
bushes/trees have a distinctive odor that's in the nose of the smeller;
either cat **** or old wine.
The odor does seem to attract bugs so I
suspect there is greater risk from molds and wood dust than
insecticides.
Your 'smell of old church' description reminds me of the little
Protestant boy's answer when asked by the Catholic lad if they swung
incense in his church: "no we have to take a bath Saturday night and the
church has a big air conditioner".
Turn to Safety, Arch
Fortiter
http://community.webtv.net/almcc/MacsMusings