I don't know if others had the same thing happen, but I added a converter at checkout only to find that one had already been included in the box. I wish I had know beforehand, but oh well... it's just 4 bucks, right? Now I have converters to spare!
SienkaTypically, LAMY pens that retail for $100 or more have the converter included, but pens that retail for under $100 do not. Sounds like you got a bonus, @Sienka!