Ensuring
that the ink on the note isn't going to fade in a matter of
years, or any tape used isn't going to cause stains that will damage
the case etc. :-)
Don't use tape. Use a paper tag with a bit of string tied
somewhere
inside the case. Standard archival procedure.
I wouldn't trust a paper bag; it'll rip and dump the (probably
conductive) screws all over the board at the worst moment. I'd use a
plastic pill bottle, probably; if that comes loose, it is much less
But some plastics degrade and turn brittle with time (and I suspect those
used for pill bottles do, since said bottles are not required to have a
long life). Again your screws will fall out and find the worst possible
points to short-coricot.
If it was a particularly rare or significant machine, I might to that
with any components I had to replace (because they'd failed). I'd keep
the originals with the machine for historical reasons. But I wouldn't
replace anything I didn't have to replace.
-tony