I have got a claim confirmation from SebastianJU, too, after sending him my PM, signed according to his instructions.
Waiting for refund.
The instructions are here:
https://bitcointalk.org/index.php?topic=1623519.msg16980778#msg16980778
Additional helpful information on signing the message is here:
https://bitcointalk.org/index.php?topic=990345
Really, it's not that hard to do.