Those are physical Tessera. Before COVID-19, people were able to obtain them after they've solved a puzzle at various live events. When that became unfeasible, the ones who solved puzzles would have the remaining physical Tessera mailed to them.
Dude those are physical Tesserae. Live drops and stuff.
It's not "Tessellation winners" as you say. It's "Tessellation Live Drops winners". Big difference.
I have one. Because I got to the Operative first in Santa Monica (the first Tesselation event), and was able to obtain the clues and codes required.