Those are best I can get. Is there something specific you are looking for?
the back stamping is a good tell. the edges of the lettering should be sharp and clean. evenly spaced and depth of print. as said, if its a private sale use a reliable payment source (paypal) if from some unknown website that you cannot find reviews on, you may order the pic and get *ick.The pic also looks real to me (based on visual glance as a Mudmaster owner myself). Whether they sell you exactly these is another story.
How to identify? Well, close look at the fonts, layout look right to me. There are some close imitations, but those fakes I have seen in this forum, they are still discernable.