I'd still go ahead and contact Ruston, LA Police.
5' 2" tall could be a clerical error. Or perhaps the conditions that could've led to stunted growth were removed, and he was able to gain another 5 or 6 inches in height. Not likely, but growth hormone therapy has produced some similar results.
As far as scaring is concerned, there is always the chance that LE is withholding information. Also, those scars may have visibly diminished or even disappeared over the course of 16 years.
Hair can change due to diet and disease. So, whether his hair is curly, straight or wavy isn't that big of a difference. JMHO
I do have a question...
When LE describes "perfect" teeth is this due to him having a great deal of dental care, (bonding, etc.) or due to the lack of gum disease or cavities, prevalent in people around MH's age?