The Mi A3 retail box contains what you’d expect from a mid-ranger’s bundle – a USB-C cable, a 10W charger, and inside the paper compartment there is a dark gray silicone case.
It’s worth noting that while the Mi A3 supports 18W (Quick Charge 3.0), Xiaomi is not shipping the phone with a QC3-compatible charger. Those are not that expensive anymore, though, so it’s not that of a biggie.
A lot of Chinese phones usually have a screen protector pre-applied in the factory but the Mi A3 is not among those. It does come with Gorilla Glass 5 protection on both sides and we can understand why Xiaomi decided against a having a protector.