At first, Los Angeles resident Wanita Holmes thought it was her lucky day.
"You are hereby selected to participate in a paid Consumer Research Program in your area of residence as a 'Mystery Shopper,' " the letter began, adding that the assignment could turn into a full-time gig "for a selected few who are able to distinguish themselves in the course of this program."
Enclosed was a check for $3,950, to be used to buy things at well-known merchants such as Wal-Mart and to test "the effectiveness and efficiency" of money-transfer services such as Western Union and MoneyGram.
"What did I do to deserve this?" a delighted Holmes, 80, asked herself.
The more she thought about it, though, the more she grew suspicious. The check certainly looked real. But she'd never heard of the company sending it to her -- Index Research Program Inc. -- and had no idea why she'd been selected to participate.
Holmes was right to be wary. This is an unusually sophisticated version of a classic scam to dupe people into wiring their money to con artists, often based in Canada.
According to the Federal Trade Commission, fraud losses involving U.S. consumers and Canadian entities totaled $55 million last year.
Steve Baker, an FTC spokesman, said authorities had seen a big increase in fake-check scams in recent months. "It's really exploded," he said.
Baker said one reason more people were being victimized by these scams was because the checks were virtually impossible to spot as counterfeit.
"The checks have brought a whole new dimension to this," he said. "It's very hard for people to know that this isn't real."
In Holmes' case, the letter she received instructed her to cash the $3,950 check and to use $100 for a purchase at a leading retailer. It told her to test a money-transfer service by wiring $3,350 to one of Index Research Program's "training agents" and to use $200 to cover any service charges.
The remaining $300 would be Holmes' to keep as "probation training pay."
The letter was accompanied by a form that Holmes would fill out detailing her shopping experiences and including all necessary information for the wired funds to be received by the company. A working fax number was provided.
Baker said the fake-check scam was particularly effective because federal regulations require banks to credit a depositor's account within a few days of a check being cashed. When the money shows up in their account, many people conclude the check is legitimate.