I bought this watch from Mr. Watch also. It was a Christmas gift for my husband. The watch came in a very nice dark blue box with the Seiko logo stamped in gold letters on the top. There was a small square leather-like pillow with the Seiko logo on it inside the box and the watch was wrapped around this pillow. There was also small empty plastic bag with the SKX007K UPC stamp on it and small rectangular silver tag with the Seiko logo.
Also included in the box was a limited warranty/instruction manual. I did not pay much attention to it at the time, but after reading your review, I took another look at the warranty booklet. You are correct in that this is a Mr. Watch 1yr warranty and not the original Seiko 3yr warranty booklet.
I am going to be very upset if this turns out to be a gray market watch. How does one determine if this is a genuine Seiko?