mods.ItemStages.addItemStage("better_chests_1", <ironchest:iron_chest>);
mods.ItemStages.addItemStage("better_chests_1", <ironchest:iron_chest:3>);
mods.ItemStages.addItemStage("better_chests_1", <ironchest:wood_iron_chest_upgrade>);
mods.ItemStages.addItemStage("better_chests_1", <ironchest:wood_copper_chest_upgrade>);
mods.ItemStages.addItemStage("better_chests_1", <ironchest:copper_iron_chest_upgrade>);

mods.ItemStages.addItemStage("better_chests_2", <ironchest:iron_chest:1>);
mods.ItemStages.addItemStage("better_chests_2", <ironchest:iron_chest:4>);
mods.ItemStages.addItemStage("better_chests_2", <ironchest:copper_silver_chest_upgrade>);
mods.ItemStages.addItemStage("better_chests_2", <ironchest:silver_gold_chest_upgrade>);
mods.ItemStages.addItemStage("better_chests_2", <ironchest:iron_gold_chest_upgrade>);

mods.ItemStages.addItemStage("better_chests_3", <ironchest:iron_chest:2>);
mods.ItemStages.addItemStage("better_chests_3", <ironchest:iron_chest:5>);
mods.ItemStages.addItemStage("better_chests_3", <ironchest:iron_chest:6>);
mods.ItemStages.addItemStage("better_chests_3", <ironchest:gold_diamond_chest_upgrade>);
mods.ItemStages.addItemStage("better_chests_3", <ironchest:diamond_crystal_chest_upgrade>);
mods.ItemStages.addItemStage("better_chests_3", <ironchest:diamond_obsidian_chest_upgrade>);