The letter didn't ask for "the drive that the data was one", it asked for "a drive with the data on it", which (when taken with comments about wiping the drive)

The letter didn't ask for "the drive that the data was one", it asked for "a drive with the data on it", which (when taken with comments about wiping the drive) indicate they just want to see a copy of the data, and named a hard drive as a convenient medium to exchange it on.