Well reputation here on KI is a bit different then on other sites. Here you can only get reputation from members of the staff. If they see that you did something spectacular they might drop by your profile and give you another box. They can't leave messages though so it is anonymous and always a surprise. It already looks like you impressed 2 people (or 1 person twice) so way to go.
By the way I am the only member on KI who is exempt from the reputation system. All other members have the ability to get reputation boxes.