I also sleeved the race cards. I first thought, they'd be cardboard like the role cards or the market card. But they are just high quality cardstock. Unfortunately, there re no fitting premade sleeves for them. So I used FFG Tarot size (orange) sleeves. They fit perfectly in width, but are way too long. So I trimmed them in lenght with scissors, which worked pretty well. There are 30 race cards to sleeve.
There are actually sleeves which fit perfectly without trimming.
I put the decks and the card that is printed on each tuckbox into clear Swan Panasia deckboxes. The decks fit tightly in there. I can still close the lid of the box all the way.
I wonder what these deckboxes look like as I have a hard time finding ones which fit. Do you have an image or link to share? That would be great!