买卖物品的箱子，买入价格是卖出价格的两倍，当金钱为负时不能买东西。价格数据储存在price.lua文件中。
Counted when a user downloads a mod release for the first time. Before Nov 2021 it counted everytime a user clicked the mods download button.
Counted when a user downloads a mod for the first time. Has no data before Dec 2022
