Interesting, but it's for a client of the firm. Not my coins. Could be a retailer with thousands of addresses, a miner with hundreds, or #13. The only way to move forward is with an escrow agreement. No signed statements or Satoshi transactions.
That's not even a real firm! joshuamutualgoldfund.com only goes to a Google error page!
You are a scammer, sue us

If it was easy and didn't involve the state, I would.