If you think he may overestimate the condition of his cards I always put in my briefcase some graded cards from 1-10. If you have some, take them out to compare to the ones he has overestimated. Just a stain or so on the back brings them down to 1-2 grade range. Everyone thinks there cards are mint-near mint until I show them a graded 8+, then they realize they have a 3-5 range card.
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