They don't really care if you purchased it. Think of it as a moving in present from the previous occupant. You are the current owner so go to their warranty return page on their web site and send it in. The sooner you do it the sooner you will get it back. This is what they say about their cutters, "Should you ever need your blades sharpened, simply return the cutter to us and we’ll repair or replace the blades and return it to you."