Here is the auction where he paid for VIP: 
https://bitcointalk.org/index.php?topic=53387.msg640282#msg640282
https://bitcointalk.org/index.php?topic=53387.msg640282#msg640282
Items received.
JFY knows theymos address ? that's something he might verify with theymos maybe.
The owner of the account has access to old posts and PMs so technically it doesn't prove anything.