The numbers turned up in Google search results. According to the article, Google indexed Blippy's raw data before it could be cleaned up. Blippy requested that Google remove the information, and Google obliged. Says a Google spokesperson:
… we learned that Blippy.com had published credit card numbers on their website … As part of our usual crawling and indexing process, these numbers became discoverable in Google search snippets. Blippy contacted us and we took special measures to remove the numbers from search results. We fixed the problem … and the numbers should no longer be discoverable in search.