At first look I would say its a used set of gears, but since they are new, that is not an option. I have been setting up gear sets for 40 years and the last ten with Chinese sets flooding in, the patterns just don't look like they used too. I would as mentioned look at the marking on the pinion to see if contact is in middle of the teeth. The backlash looks good on your pictures, but since it covers the whole tooth you can not tell pinion depth. I purchased a pinon depth tool and if it measures right and the backlash is right with a dial indicator, I don't worry as much any more about the contact pattern. It also matters if the gear set is a hunting or non hunting type, as well as if the gears were hobbed or face milled when manufactured.
http://www.shoptalkforums.com/viewtopic.php?t=145363thread about the differences.
