He'll use that box for great things someday… (SID DA 010) is a comic published in 2015 on DeviantArt by Sidisney.
Description[]
A flashback to Hattie's childhood: after his father receives a new hat as a gift from a colleague, his son asks whether there's something for him, prompting Gregorius, caught empty-handed, to give him the hatbox itself — the very same hatbox Hattie would use all his life and even beyond.
Author's Comment[]
“I realized nobody who has an HC for HBG has ever really put much thought into how he got the hatbox that gave him his name. I figured he's always had that thing ever since he was mortal, and that he got it at a young age.”