First, just to be clear, we didn't purposely leave any posts out.
There were only two cases of any known posts not being caried over. I'm planning to hand move them over the week. The first were posts made to the Vanilla board. There is no migration scripts (that we were able to find, links welcome?) for Vanilla -> phpBB2/3. I'm going to write one, but it will take a couple days until I have the time. The second was the "G1G1 - Give 1, Get 1" forum from olpchelp.com. This was a data handling blip, and I'm planning to restore them as well. Probably in the next few days.