Is the Xiaomi Max2 sold by Tmall in this store true? How come 4+32GB is only 999 yuan, and the cheapest one in other stores is also 1068 yuan?

Are you sure this store is Tmall? Or from Taobao? If it is a Tmall store, you can trust it. Generally, mobile phones support seven-day return without reason (the general requirement is inactivity). Merchants are required to issue formal invoices (electronic invoices) when purchasing. Don't activate after you get the goods. You can check the authenticity online first. If it is a shop on Taobao, it is recommended to choose carefully.

Personally, I suggest you go to Xiaomi Tmall flagship store or Xiaomi Mall or JD.COM self-operated Xiaomi flagship store to buy. The price difference is not very big, so spend tens of dollars more.