yes, you're right! i din't realize that until you mentioned.
from Tokico USA website:
http://www.hitachi-hap-la.com/TokicoGasShocks/faq/
Q: Does TOKICO offer a warranty on their products?
A: TOKICO offers a limited lifetime warranty for all of our performance shocks purchased for street use. Products used or designed for competition are not covered under warranty.
Q: How do I make Warranty Claim?
A: You need to have your original proof of purchase and make a claim with the business that you originally purchased the product from. If they are no longer in business, you will need to work with another authorized distributor near you.