Now notice that chrissy222333's post number is 178006&mid=178009. The first number is the TOPIC number, and the second number is the POST's number in the board's sequence.
There will also be some numbers and letters after those two numbers in the last line, but DISREGARD them. They vary in accordance with the VIEW you choose.
If you usually open posts by traversing the board from post to post — without closing one post before opening another — the resulting URL will be meaningless to all but Yahoo. That URL informs Yahoo how many posts you have traveled from your start to when you close a post. A post's REAL URL can be discerned ONLY when you open a post FROM THE BOARD and not from within a preceding or following post.
2. Starting at the bottom, let your cursor hover over the post's subject line and note — in your browser's STATUS BAR — its number that looks like 178006&mid=178009.
That second number is the one on which you want to focus.
3. Hover your cursor over the next post. Is the second number 178010? If so, no post is missing between the first and second posts.
4. Continue on up the page like that. If you come to, for example, two post numbers with a gap between them, those MISSING numbers indicate the deleted posts.
Sometimes only one post will be missing in action; other times a parade of them will be AWOL.
Just a suggestion . . . it might help if you post the problem — repeatedly — on the YHOO stock message board. It's likely that Yahoo personnel read that board assiduously. Maybe the complaint posted there will eventually reach Yahoo programmers.