"A record with the supplied identity could not be found"

I get that as well now.
Sadly, 50BTC is now off all of my backup pool records.
R.I.P.
Well try Losing 44.25 BTC that was supposed to be Sent to the Company ( As Per the Contract ) that let you Test / Do a Hands on review of the miner and now have them Threatening to take legal action against me for not sending the funds that i owed them
Now tell me what the hell i am supposed to do if 50btc just up and runs with the funds
Negotiate with your company a delayed payback.
Buy 22 bitcoins (take up a loan if need be) and cautiously play the market to double your capital. (I managed to earn about 10% on top of my original investment on this latest rally only, and it's not yet over.)
Pay back what you owe.
Not to pour salt on your wound, but this outcome is partially your fault as well. There was a history of pools going down and losing their miners' bitcoins before. It was stated many times on the forums not to keep any significant amount of money in a pool.
Actually, never keep any significant amount of money in any address that you don't have a private key of.