does the female plug not attach to the transfer switch box, it looks like there is a space for it on the transfer box on the lower right coroner

This unit DOES NOT come with a female or male plug. I purchased this because another reviewer stated that this 50 amp came with a plug that went on the outside of the box. This does not come with any kind of a plug at all. I also noticed the space for the male plug to be recessed inside AND the wires are there but NO plug. You have to buy seperate