>>9892671The first time they did convention exclusives was at SDCC 2018. They had these metallic shells for the replica P1 and P2 models. But the wild part was that these were the first of the replica models on the market, which wouldn't be available at retail for another few months.
The last convention exclusive was actually this year at Star Wars Celebration, where they had the metallic R2-D2 Tamagotchi in commemorative packaging.