The first time I did this was on a Pepper cache when I first started, maybe a few months after my first find. I had an eTrex and downloaded a PQ to it and went to find it. Manually logging, after finding it, I noticed it was archived about 2 weeks before I found it. At the time I was surprised to see that gc.com let me log. She had archived it on one DNF, and it was there and in perfect condition. So I felt it reasonable to log - found it, signed it.
The rules state that a CO can archive and that if the container is in place to please remove it. There is no requirement to remove the container and nothing that addresses finds on archived caches. Usually, the vast majority of archived caches are still loggable. There are some cases, though, where GS has locked the page and allows no further logging for one reason or another. So they apparently do not have a problem with logging archived caches, generally speaking.
I don't seek these out. But if it's there and I have the info on it, and the cache is found, I say "why not?" I view the archive as a removal from the masses. But not a removal of the cache IF it is there. If the cache is NOT there, then no log, obviously.
This issue became a huge blowup recently on an out of state forum. Just got me to thinking that on this, like some other topics recently, not everyone may feel the same about. Thoughts?