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Added Default generated box JSON now includes an English _tutorial object. It documents file naming, keys, drop rates, random weights, entity formats, grade lists, item objects, components, legacy tag, and the recommended workflow. Added server-authoritative animation item data to PacketBoxOpenResult, so the client animation strip and final reward use the same server-selected result. Added request id matching for box preview and open result packets to prevent stale client responses from being consumed by the wrong screen. Fixed Fixed client GUI opening from the wrong thread in integrated server play. Box screens are now opened only for the local client player and scheduled onto the client thread. Fixed RenderFontTool crashing when a screen font is temporarily null by falling back to Minecraft.getInstance().font. Fixed open animation waiting forever when the server rejects an open request, such as during short cooldown, missing keys, empty boxes, or invalid held items. The server now sends a matching empty result so the client exits cleanly. Fixed animation speed behavior when the winning item was placed near the start of the strip. Winning indexes are now selected from a late animation window, making the animation start fast and slow down into the reward. Fixed preview text for empty boxes being hidden behind the 3D box model by drawing the warning above the model with a foreground overlay. Fixed several boundary cases around negative or oversized weights, odd entity drop-rate arrays, empty item lists, null item stacks, and list size limits in custom packets. Changed Opening cooldown is now a short anti-double-click guard instead of the full animation duration, so cancelling an animation with ESC does not block the next manual test. Box, grade, packet, and utility data paths were refactored to copy mutable ItemStack and collection data at boundaries. Utility classes were made non-instantiable where appropriate. RandomItem now handles null and empty inputs defensively and uses long total weights to avoid overflow. CsboxProgressScreen now uses frame partial ticks as the render interpolation factor instead of mixing velocity into the interpolation amount. Notes Existing JSON files are not overwritten. The _tutorial object appears only when the mod auto-generates a new default JSON in an empty config/csbox directory. The current Gradle mod version is 1.0.4, so the expected release jar is csgobox-1.0.4.jar.