When you buy stihl equipment it's the dealers responsibility to register it. Found that out when I bought my ms400 this past spring.Yep, warranty is one of the FIRST things I consider and one of the first things I ask if someone wants me to work on so called new eq. How old is your eq and are YOU the original owner. Sometime though new is a piece of vintage 30 year eq and it just NEW to them.
I quite often for my own new eq I label a piece of eq as to when the warranty expires (or label the owners manual with such and attach the purchase receipt as indicated in the owners manual the the requirements such as receipts, registering, etc.
Several companies (appears most) hope you lose your receipts or not register the eq so they can easily VOID a warranty and not have to put up with your whining/moaning and crying.