Corrina, sorry, I can`t find any info on a dog named Buster and the 9/11 searches. Maybe someone else has some info?
I did however, find this tribute slideshow to honour them.
Canine heroes tribute slideshow

Molly, no luck, so far, on getting an e-mail address for Sergeant Morgan. Though I did get an snail mail address for the Corps in Aldershot if you are interested?

When doing the searches I came across this article on Sam, the GSD who was posthumously awarded the Dickin Medal last year.
War medal given to hero dog.

Chris