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Here is another one (from June) to add to your list Cindy. The propane trucks were recovered but, according to this article, they don't know about the propane.

SNIP: LAREDO, Texas (AP) - Two propane-delivery trucks were found Wednesday after being stolen from a gas company over the weekend, a theft that raised fears of what could happen if terrorists got hold of the explosive fuel. The trucks were found on a highway just outside of Laredo, San Antonio police spokeswoman Sandy Gutierrez said. She did not know whether the trucks were still carrying the fuel.

Also, at the end of the article:
SNIP: Also under investigation is the weekend theft of 15 gas canisters from an ambulance supply company. Authorities do not believe the thefts are related.

http://www.thebatt.com/news/2004/06/03/News/Propane.Tanks.Stolen-684255.shtml