My two cents on the free mount kits: I didn't fill in the "free mount kit" form for my Noctua NH-L12. I just purchased it at a reseller.
I'm one of those idiots that pre-ordered a Ryzen CPU. Yes, I'll give you my home address to forward your hate and disgust in a moment. Because I already feel like a tool, I don't want to stuck waiting weeks for the kit to be sent.
http://noctua.at/en/nm-am4-mounting-kit-order-form
Not to say Noctua isn't an upstanding company, in my regards they are. But if all of my stuff arrives (hopefully) next week, I don't want to have to wait to be able to use it because I'm missing a few strips of metal and some screws.