in my macks they seem to have a freckjled appearance all over, even the legs and 'claws' have speckles when they are older..
i have a few that i made a mistake with, i beleive i never labelled them bc/ it was soooo obvious at the time, now that so much time has passed, and the bin had been re-labelled and so forth, i am not sure...she is now 'possible mack' lol
-good luck, hope you can test breed it or maybe you can with someone else's gecko work out a plan to test him/her to see if it produces any macks..