This is a very special feature because each associated box ID can hold any item, and it is not possible to monitor all associated box IDs through script control. I think this feature may not be achievable But you can still make some controls through the scene. If possible, players can use trains as much as possible without associating boxes through announcements, or control the maximum number of associated boxes that each team can use through scripts, or purchase associated boxes through the market, or determine that if the distance from the main base exceeds a certain distance, no associated boxes will be placed These all require scenarios to support, and the associated box cannot provide such diverse requirements According to your current needs, distance can be used to limit (from the center of the player's base on the current layer, so that the associated box cannot be used outside)