When the sell wall order expired on Steem-Engine, we burned 180,000 before we put it back up.
This was 10% of the last sell wall. The initial sell wall was 2.5M STEM in the original post but we only put 2M up. The other 500K has not been issued.
I don't suspect we will ever reach the sell wall any time but I will keep putting it back up every 30 days when the order expires.
We previously burned 4 Billion tokens to bring the max supply down to a reasonable level to show we will never issue those tokens under any scenario.