One day, sooner or later the first scratch comes of every instrument and device. Today came, after a year in my possession, my the one on my Model D Reissue. Thankfully a minor one … but still a small scratch. What is the best way to hide minor scratches of the kind of wood the new a Minimoog is made of? Lineseed-oil or something (to make a minor scratch darker and about invisible)?
Making some big nasty scratches will hide the minor ones. 
There are a number of products available for removing scratches from wooden furniture that should do the trick.