Sinve orders are open and accounts are as well .. we ahould be able to figure out which account opened the offee .. can you give us a link to the block or the zransaction? I'll take a look when back from Dublin on tuesday

Fortunately @valzav is already working on a solution to prevent such mistakes from happening in the future:
https://github.com/cryptonomex/graphene-ui/issues/445

I don't know if this is related:

https://bitsharestalk.org/index.php/topic,19772.0.html

Just in case.

A little earlier I found an order for Metafees:USD which was significantly above the market price. I was initially going to take it for a little profit until I realized that the price was off by an order of magnitude and most likely a typo. As a result, I still filled the order, but with the intention of refunding what would have been a pretty nice profit. So if you had an order on that orderbook which was executed about an hour ago, please pm me and we can try to figure this out. Or if someone knows of a way I can Identify this person through the blockchain. Please let me know.