Today I'm doing my first of two iPhone X unboxing videos, and to start off with it's the Space Grey colour variant. iPhone X is available now and starts at £999/$999 for 64GB. A larger 256GB version is also available for £1149/$1149.
"Demo" model. Pretty sure that means it has Apple's demo content, and I don't know why boxes for Apple demo devices don't differ compared compared to the boxes for Samsung Galaxy "Live Demo Units". I'm guessing you work at an Apple or a carrier store, or an authorised retailer for one of the two.