A quote from an earlier post
At the beginning of Act 4, the teleporters stones disappear and we must play the end of the game without them.
Don't look after your stones you will not find them.
In act 2, there is a dialog saying that the teleporters will be taken back later.
So at the beginning of act 4, no teleporters anymore. <img src="/ubbthreads/images/graemlins/cry.gif" alt="" />
It is by design that the pyramids disappear, in act 3 there is an inventory trick that can retrieve them (before the latest patch there was a bug where they would disappear in act 3), there is no way to get them back in Act 4.
as for the posts disappearing, the forum server crashed.... but was restored to the latest backup, so some of the latest stuff was lost... Raze did however reply with something very similar in answer to your post...