Don't forget he can simply edit the winnings to make them look legit. The only proof we'd believe are the round IDs.
I saw that username on primedice last night with another user. There are a few that hunt the big payouts. They were posting legit bets win and LOSS in the chat. There are big bet hunters out there and the username from his posts I recognize as one of the primedice big bet hunter regulars.
In first place maybe it is not true if you not going to research but because of this maybe there is chances the wins is really true maybe they need more proof that is legit or the real amount of wins to trust to the ops won in Primedice. Everyone want to win like what Op got even he have only a little money they will got thousands dollars compared to the other people who have thousands money to play dice but they are lose.
Anyway, why you guys not believing on something that he said? It just not matter OP are trying to brag their winning or anyone winning, as long as there is a winning so be it. The point of this post is not to share how to win it or bragging about the winning but I see this as one of the trick to promote primedice which is really successful to have a great attention right away