The floor-completion box awarded to Carl on reaching the ninth floor, at platinum grade.
Granted in the arrival notification stack: 'Congrats, Crawler. You have received a Platinum Venison Box.' It arrives alongside his leaderboard rank of 1, a bounty of six million gold, 231 septillion views, 887 quadrillion followers and 420 quadrillion favorites.
It sits unopened while the chapter's emergencies pile up. Donut, by contrast, has a celestial sponsor box and a Former Child Actor Accessory Kit waiting in the saferoom mailbox and insists they go straight there so she can open hers - which is the practical reason they head for a saferoom at all beyond regrouping with Imani.
Not described; a platinum-grade reward box in the crawl's standard style.
Carl's floor-nine arrival reward, unopened as the chapter closes.
Also appears in books you've already read — spoiler-safe to their endings: