Here.

The data theft was claimed in letters left with political party offices in Franklin and disclosed in several Tennessee-area newspapers. Jean Barwick, the executive director of the Williamson County Republic Party, said employees in the GOP office found a small package on Friday with a hand-written address. The package contained a letter and a computer flash drive, she said.

An anonymous posting on a file-sharing website said the returns were stolen Aug. 25 from the accounting firm's office. After "all available 1040 tax forms for Romney were copied," the posting said, flash drives containing encrypted copies of his pre-2010 tax records were sent to the firm and to Republican and Democratic party offices.

Barwick said she turned over the materials to the Secret Service. She said she was not able to confirm that copies of any tax returns were stored on the flash drive...

Well this at least confirms that the GOP office did indeed receive something that could have been Romney's returns.