i also purchased 50k (old) IOTA from CH. Hopefully he comes back. We can't know what's the reason that he disappeared, maybe he has family or health issues, or got hacked... 

https://bitcointalk.org/index.php?topic=1360660.msg14151739#msg14151739

https://bitcointalk.org/index.php?topic=1360660.msg14190209#msg14190209