I was talking to customer service today about the price on LL and I also address the issue of missing content. She said she would look into it. I doubt the pipes are any where to be found. They also did not include other items that were advertised as being there.
One thing I don't understand is if you try to move the pipeline, it won't line up with pipeline that is a little higher than the ground anymore. And you can't move it up and down. It stays at ground level. Wish they had a fix for that!
Anyway...there's a mod for the pipes to appear in the game here: http://www.modthesims.info/showthread.php?t=469435