Which of the following is not true of the Moonlight Maze attacks?

They began in March $1998$ and were not detected by the U$.$S$.$ government until the spring or summer of $1999.$

Some of the attacks were traced back to a computer system located in Russia.

A post$-$attack analysis indicated that files were deleted but not stolen.

The information accessed during the attacks was located in a printer queue where it was neither encrypted nor protected by a firewall.