So I recently was awarded the Tusked Dragon Priest mask from the Scalecaller crown crate, and it looks incredibly similar to Miraak's mask in the Skyrim Dragonborn DLC. The official game description is as follows:
"This is a replica of what Dragon Cult scholars call the "Tusked" Dragon Priest Mask. Though it's been seen in certain ancient engravings, to date no historian has been able to identify it with a specific ancient Dragon Priest."
I think this could be a nod to the fact that Miraak disappeared way back during the Dragon War in the Merethic Era, and once the Dragonborn in ESV starts asking about him, nobody seems to remember who he is, like he was forgotten either through the passage of time or by daedric influence.