Looks high shine to me but not a platinum, as I can see some orange/red on the tips of his fins. Although it could just be the lighting but that second picture where the head is in the dark, almost makes me wanna say a high shine. Look at it this way, if it is a high shine, Rapps just made a bad deal, and you got a good deal.
btw i grew my high shine from 5" and i bought it as a regular silver but came out high shine when it was 5" no blue/green coloration and no pinkish on the tail