If your thread gets moved you will be notified by a moderator that it was moved and why. If it is posted in the wrong forum you will see a redirect to where it was moved.
Posts do not stay at the top of the forums. We are a very busy board and depending on which forum you posted in, other posts will bump your post to the bottom.
It is always a good idea to just search your posts if you lose one, or subscribe to the thread so you are emailed if and when someone answers it.
Thanks Sam for finding the thread in question.