Help Identifying Ducks…

I have searched everywhere to identify these ducks that frequently visit our pond. But no luck, what so ever, and so I need your help. The pictures I’ve taken are really crappy and the ducks cannot be seen clearly, I’ve tried my best!

They have bright orange bills & feet, definitely the brightest I’ve seen on a duck. Grey head that comes down the neck about half way, and then from there down the wings, and back is a dark burnt orange/red color. There is a thin white line at the tip of the wings. And the belly is a dark grey/black color.

They have been visiting since around the beginning of this year. We see them about once or twice a month. It’s always the two of them, except yesterday it was just one. They never get in the pond they just walk around it and get in the wood duck box.

My fiancé is an avid hunter, and he even said he hasn’t seen them before moving into our house.
So if you know what kind of duck this is, we’d greatly appreciate it!

TIA!