pixel_player774320857 Challenges as well? The Advent 2019 isn't repeated, but there are 258 in all mines and challenges. If you're missing them, you might have used them in some shop item.
pixel_player774320857 Ofcourse if it has a green checkmark, there won't be any in them. They do count as tiles.
Contact support: http://help.diggysadventure.com/newticket
Scroll down and choose category.
They will probably be able to check where they went.