I had the same issue. It looks like there is a way to check. I'm not sure how accurate it is but if you go back to the return and go to "e-file" at the top and then go to "attach pdf files", you can see at the top of the box in bold it will say something like "attachements for your 'client' (transmitted) 1040 federal return." I think since it says transmitted that it was sent with the return.