Confirmed and partly fixed. Reward boxes are a distinct kind of consumable and the code had no handler for them at all, so using one did nothing. That is wired now, driven by the reward table in the item data rather than a hand-written list. Leaving IN PROGRESS because the reward CONTENTS for some boxes are not in any file we hold — the original server rolled them — so a box may open and give nothing. If you hit one that does, tell me which and I will check whether its table is recoverable. Start with Golden Pig's Shiny Egg.

Closing this - Mark's v54 pass confirms reward boxes open, starting with the Golden Pig's Shiny Egg.

The prize was never the problem. All 56 reward tables were re-extracted fresh from Item.wz (Consume/<id>/reward) and compared row by row against what ships: 56 of 56 match exactly, nothing missing, and the Shiny Egg has had its full 43-row pool the whole time. The open was simply SILENT - no line, no effect text - so it read as "nothing happens", which is exactly how you put it.

Opening a box now says what came out. The 23 boxes whose rare rows carry a world-broadcast string in Item.wz also announce it, on serverNotice(6) - BM_NOTICEWITHOUTPREFIX, which is what Cosmic uses. Those strings had to be newly extracted, because our catalog only ever carried a boolean flag saying "this one broadcasts" and never the text itself.

LIVE on the published build.