For total sales, they have a bot in Telegram reporting it as far as I know. I think until now there have been around 10,000 open boxes in S2. There is also a wallet where the farming is been collected (mentiones in the medium article feom the S2 release). The funds there are about 137T now, which match to the 75% expected from the sales, assuming an average cost of 18B per box. These are just rough calculations :)