How do I register my new speaker cabinet in the United States?

The warranty card gives me a weblink of www.marshallusa.com/warranty, but when I go there, it says; "EPIC 404! AN EAR OCCURRED WHILE PROCESSING YOUR REQUEST." 

Seems that the JCM-1C 50th anniversary is not in the database for cabinet registration.

SN M-2012-43-0525-1 purchased on April 5, 2014

Recently, I have purchased thru Andertons Music U.K, for a stack of

ASTORIA Dual head and matchinf 1x12 cabinet.

M-2015-52-0008-1-112 and M-2015-43-0205-0  respective S/N

However, in the Registration column,you have not provided the amp model yet. 

Slow hand did you go since almost more than year has passed away from the launching

of the amplfier ASTORIA series and matching cabintes. please clarify.