They purposely make the entire thing very cumbersome to dissuade the claims process and force the busy-types to just go ahead and purchase a replacement. My family has made claims from Budds and Sauga. I would print the warranty note from the Pirelli website.
Talk to the manager of the Parts Department first.
Note - another user has posted the certificate on the X3 board:
http://x3.xbimmers.com/forums/showpo...78&postcount=8