JPMorgan archive has monthly data back to February 2007
If you would like to see an example of a covered bond issuer’s monthly reporting, including detailed data on the cover pool, this is a good place to start. The particular covered bonds that are the subject of these reports also have historical significance, since they were a “first” for the U.S. when Washington Mutual introduced them in 2006. Of course, they are now under the aegis of JPMorgan, on whose website these reports currently reside.