The problem of these so-called "rogue" websites extends beyond the NFL to other products, including luxury clothing, digital media and prescription drugs.
The agencies have seen an increase in websites that ship products directly to consumers, and law enforcement officials have increased surveillance of international mail and express couriers. China was the source of 62 percent of the pirated and counterfeit goods seized last year by the agencies.
Federal and local law enforcement agencies can use criminal statutes to conduct investigations, seize pirated and counterfeit products, and arrest people. But it's hard to track down the originators of the schemes in China.
Companies and major brands, such as the NFL, Ralph Lauren and North Face, have turned to filing civil actions against the operators of hundreds of website domains, for infringing on their intellectual property. Many of these websites use legitimate methods for accepting payments from consumers, including credit cards and PayPal.
In a key case nearly two years ago, Polo Ralph Lauren and North Face won a $78 million judgment against Chinese counterfeiters. Though experts say the companies will likely never see payment from the Chinese operators, they were able to seize hundreds of thousands of dollars from the operators' online banking accounts.
In the past year, the NFL has filed a pair of lawsuits targeting 80 operators, mostly based in China, who were selling knock-off merchandise through hundreds of sites.
According to a lawsuit filed last month in federal court in New York, NFL investigators have traced the hundreds of websites to a group of Chinese operators who copy the graphics of NFL websites and field their own online stores.
The websites are usually registered to fake names and addresses, and these "rogue" operators set up new sites almost as quickly as the NFL shuts them down. One Ravens-related site that the NFL shut down was BaltimoreRavensJerseyStore.com.
"They're very prolific," said Tamara Tarbutton, vice president of North Carolina-based Vaudra Limited, which investigates rogue websites for the NFL and other brands.
The operators "create every different variation, including every NFL team name," Tarbutton said. "They'll add hyphens. [The sites] exponentially multiply like rabbits. It's so inexpensive to set up a website, and these Chinese counterfeiters have it down to an exact science in the way they populate these websites and redirect traffic."
The court tactics that the NFL and other major companies are using to take down trademark-offending websites are not without their critics. The NFL supports the Stop Online Piracy Act currently wending its way through Congress.
SOPA would give broad tools to government and businesses to shut down online entities that sell pirated and counterfeit merchandise, or stream digital media content. But Internet advocates say the law could have a chilling effect on free speech, due process, and e-commerce across international borders.
Skarzynski, who'll be wearing her official Ray Rice jersey at the game Sunday, is still angry about the botched Webb jersey. She believes the team and the NFL should do more to protect their fans.
"This one became the family joke," Skarzynski said. "We holler out, 'Go Ewbb!' It's become a joke, but it's really not funny."