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Victim Maureen Finn, 68, was sworn to secrecy about the scheme and has now lost a minimum of £127,460.
She also gave him £8,000 after he claimed £40,000 had been stolen from his car.
The oldest victim Vernon Williams, 91, lost his entire £20,341 investment.
Fraudster Price ran a seemingly successful Halifax franchise branch in Gowerton, Swansea, decked out in Halifax livery and with workers dressed in proper uniforms.
One of his own cashiers Jennifer Ellis, 52, lost a six-figure sum and her aunt Mabel Fletcher, 86, was also a big loser after paying in £217,000.
Price even conned friends who had known and trusted him for more than 20 years.
Initially he paid them interest but when the cash ran out he made it look like money was being deposited in their accounts by fiddling the figures.
The web of deception was so complicated the judge was forced to adjourn sentencing until today after hearing more than four hours of evidence.
Mr Clee told the court about the day auditor Leslie Tucker turned up at the office while Price was on holiday in New York - paid for with stolen cash.
He was told by unsuspecting staff that there was a £7million float in the safe.
Mr Clee said: "Leslie Tucker thought that had to be a mistake.""
Judge John Diehl replied: "That's putting it mildly." Mr Clee went on: "On opening the safe what was found were three small shoe boxes. Inside two there were envelopes. In one was a Halifax compliments slip, rather appropriately. On the back was written, 'I Graham Price borrowed £7million from the Halifax float' and it was signed."
What the staff did not know was that Price had been diverting the Halifax cash into his own account. He arranged for £4million to be sent to his office in credit transfers from the Halifax in the space of just 11 weeks last year.
The offences stretched from January 2001 to last November when Price was arrested. Mr Clee said: "He said the money from investors was used to feed his gambling habit. He admitted theft of all the money."
But police investigator Richard Jones told the court Price had only wagered £700,000 of the stolen money with online bookies Betfred.
He said: "On the face of things it looked as if he was betting an extreme amount.
"But he did win sometimes and was then putting the money back in.
"He was shown to have £6million winnings on £7million online bets with Betfred in Warrington."
The judge then asked: "So the question remains on your mind, 'Where has it gone?'"
Mr Jones replied: "That's correct."
One former friend said yesterday: "We all knew Graham to be a quiet man. No frills. The kind of guy you knew was solid but never really noticed. Then suddenly he started acting like he'd won the Lottery. There were the expensive top-of-the-range motors.
"We put his extravagance down to a belated mid-life crisis. We certainly didn't think he'd been stealing the customers' cash."
Price's wife Jennifer, son Julian, 27, and three staff members at the Halifax office were also arrested by police but found to be completely innocent.
Later it emerged the Halifax had frozen victims' accounts and cleared them of cash saying it was also a victim of Price's scam.
A spokesman said: "There is no doubt these transfers were bogus. No money was deposited, these were simple entries to the accounts with no money to support them."
PRICE'S SPENDING
- Bought a £500,000 share portfolio in son Julian's name.
- Bought £110,000 of Premium Bonds in the names of himself, his wife, son Julian, 32, and daughter Victoria, 27.
- Paid off £100,000 in mortgages on his building society office, his home in Swansea and another house owned by his son.
- £34,000 on a Mercedes CLK and £37,000 on a Mercedes ML 270-Had £65,000 in three internet betting accounts withBetfred and Betfair
- Paid £100,000into his wife's bank account last July.
- Spent £16,000 on a new kitchen and enjoyed luxury holidays in New York and Portugal costing £4,500.
- Built up a share portfolio worth up to £65,000.
- Paid racing tipsters a total of £745,000for information.
- £250,000 on 13 horses owned in syndicate and £69,000 on a horse called Carte Diamond which he bought alone.
Training fees cost £32,000.
MY HELL OVER LOST £500K
SUZIE Mills invested £500,000 with Graham Price after he promised her big returns.
She sold her flourishing bed and breakfast and her home to bankroll the venture.
Now her dream of setting up a private healing centre in retirement has turned into a daily grind of fighting to make ends meet.
Ms Mills, 58, of Honiton, Devon, now lives in a rented flat, struggles to pay bills and has a low-income job in a nursing home.
She said: "I've been very near to cracking up. My life has been totally destroyed."
Price's mild-mannered exterior convinced her the investment was safe.
She even advised a friend to invest his life savings. He died 10 weeks ago of cancer and was troubled to the end by how he would cope.
She said: "The last few months of his life were extremely unpleasant. It's all been a nightmare, an absolute nightmare."