How I can don’t know Apple phones original or river beach phone refurbish please help me I want to buy a new one iPhone 11 Pro Max 256 GB

I want to buy the iPhone 11 Promax, but I am afraid that it will not be original from Apple, so I want to know these devices are now on the market and also when the devices were withdrawn from the Apple iPhone 11 Promax store. There are a lot of devices that are manufactured in China, so what is your comment about this order and thanks