My answer;

Firstly,
-I would note the username
-Run the name against every search engines,there is.
-Find out the person's location
-Pack all my family members along to go and beg him or her.😢

Lastly, What would i be doing with 400 steem??😢😢
Even transferring ordinary 3 SBD,i do write down the username, then i type it back...letter for letter😂😂

Imagine trying to transfer to @honourmaus

Or @official-hord