Did you use the Desktop CD/Download program last year? Then the only copy is on your computer and Turbo Tax doesn't have it even if you efiled it. You should have the data file ending in .tax2016 on your computer to open in the program. You should have also saved it as a pdf file when you were done. The files should be in your Documents then in a Turbo Tax folder. Or search your computer for all files ending in .tax or .tax2016. And check the Recycle Bin. And check your backups. Do you still have the program installed? You can reinstall it from the CD or download it again.
Did you use the Desktop CD/Download program last year? Then the only copy is on your computer and Turbo Tax doesn't have it even if you efiled it. You should have the data file ending in .tax2016 on your computer to open in the program. You should have also saved it as a pdf file when you were done. The files should be in your Documents then in a Turbo Tax folder. Or search your computer for all files ending in .tax or .tax2016. And check the Recycle Bin. And check your backups. Do you still have the program installed? You can reinstall it from the CD or download it again.