That sounds right. It is a painted matte surface and like any painted matte surface, oils and stuff will eventually build up and cause some shinny spots. It doesn't happen readily, but you do notice it most in the areas you are in frequent contact with. Most notably the palm rests. It does wipe off easily. Mostly even with a dry microfiber. When that doesn't work a slightly dampened one or using a tiny bit of dish soap when you dampen it.
Another product that works well with is a very light spray is Chemical Guys Meticulous Matte Detailer on a microfiber. I wouldn't recommend buying it just for that purpose, but I did happen to already have some on hand for the matte finish of a motorcycle. It is made for matte, satin and other non-gloss finishes.