"We cannot say with certainty that anything related to Girl Scouts that is purchased through a third party retailer are officially licensed Girl Scouts products," a GSUSA spokesperson said via email. "Furthermore, even if they are genuine Girl Scout Cookies, neither Girl Scouts of the USA nor our licensed bakers can guarantee the safety or quality of the product, or that the cookies have not been tampered with. Many cookies sold via third parties are often expired."
Numerous negative reviews on Amazon product pages suggest that dozens of people who purchased the cookies received ones that were stale, broken, and in some cases, melted; however, there are also plenty of positive reviews. But in addition to potentially trading quality for the convenience of two-day shipping, GSUSA argues buying the cookies through a third party defeats the purpose of the cookies altogether because you're not interacting with a Girl Scout.