I have visited this facility several times on inspection tours. The facility in question is a breeding facility, supplying animals but I don't think they do much, if any, research. Calling it a lab conjures up images of animals housed individually indoors in tiny cages. A more accurate picture of this facility would be a zoo: large, communal enclosures outdoors with climbing structures and other apparatus.
Escapes do happen, especially when animals are kept outdoors in social groups. The fact that this resulted from human error,while unacceptable, does say something about how well the facility is designed otherwise. IF we accept the necessity for animal testing, I think it is more humane to raise the animals under these conditions.
I can't speak to where they all end up, but a significant number go to research on organ transplantation. Remember the recent articles on patients receiving pig hearts? That could not have happened without animals from this very facility - they paved the way for determining how to reduce immune rejection of xenotransplants. There are too many unknown variables for us to model this in any way other than the use of non-human primates.