The marks on him look like he just hurt himself either in an escape attempt, or crawling underneath something. A gouge on his head, a scratch along the top of his neck--all suggestive of that. I would not turn down a snake with those types of very minor injuries just because it wasn't flawless, particularly if it was marked down. A few scars from misadventure don't mean it isn't healthy. I have a female that gouged her snout trying to force her way out of a bin in transport. I have a snake or two with scratched scales down the top of their neck or back from crawling under their water bowl. That type of scrape doesn't even break the skin. I'd pay close attention to the head gouge and treat it with betadine--vet him quickly if there's any sign of inflamation or infection, but he looks like a decent mojave to me.

Of course breeding him will prove it out--if you get any pastels in the bunch, then you know. If he does have pastel in him, it probably wasn't a very good pastel, though. I won't say absolutely no pastel, because the pictures are suffering from lighting/color issues, and some aren't clear.