When I bought 12 mini saddle brown case and wanted to build natural patina (just like with my case for X), but then I've read all bad experiences with new one, and here is what I've done: I took kiwi brown nubuck renovator spray and apply it on my new case (first I treated it with Brooks Proofide, with no visual effect). Then I let it dry, and then polished case with dry cotton cloth and apply very little argan oil (for bit of shine). Luckily, it turned out excellent, just like I wanted! Heres couple of images, daylight.