I have a pair of Mag 30s and when I discovered that recall I contacted the importer a couple of years ago. They no longer have any of the replacement crowns that were intended to replace the dodgy ones. I also contacted an university friend who now works for Rockshox in California (lucky bastard) and they don't have any crowns either. They were not unduly bothered by a 15 year old recall, I guess the design life of bike parts is rather less than that.
The granularity seen in those photos is present in my forks and the corroded material has less strength than chocolate. The crown on my forks was fine until I rode in the snow a few years back so I'm not sure heat is the issue, I suspect salt.
My problem has recently been solved by buying a pair of Pace RC35s of ebay and talking nicely to Justbackdated.