I'm not sure if it's actually 5 comments, but not many people read my blog, so those comments count!
It was after the database upgrade email sent out.
Some blog posts show a comment/reply #, but none show up, like on these pages: http://www.kissire.com/2012/08/
others have no indication there was ever a comment, like:
I finished deleting out a backlog of spam comments today and noticed the old comments were missing from my WP interface.
Any ideas on how to try and find them or convince WP they really are around somewhere?