These are the cardboard paintable letters you can get at Michael's or Hobby Lobby. Stack them and make a cool vertical word.
Also on these boards
cardboard type. I have great appreciation for how difficult this is after Studio B with The York and STUPID-HARD CARDBOARD SHIT THAT MADE ME GO CRAZY!!! ARRGGHH!!! Whoever did this had mad patience and super deep cardboard paper cuts... I'm guessing.