The bounty is not doing to do much if there's no way to obtain more information about transactions.
Again, I'm not saying that Phinnaeus is lying here - just that without more information it's not possible to prove anything, neither on his or InstaWallet side.
One thing that would easily tell everyone a lot would be the audit which was supposed to have happened. Or information from the analysis of the supposed hack. Or from the police investigation which was supposed to be underway. Or especially all of the above.
For some reason none of these things seemed to be very forthcoming and any questions about them were studiously ignored by the Paymium folks for a long time. When little bits of information did appear they were extremely vague. True, it is 'none of my business' since I was payed off for my minor loss at the place. An audit of the records from Instawallet, on the other hand, may very well be the business of those who have not been paid what they claim to be owed, and would very likely confirm or deny the parts of PG's story that he can remember. It is a very reasonable hypothesis that this is exactly why the audit, if it ever happened at all, remains shrouded from view.