I am also on the same boat, at least kind of. My case was filed concurrently, got all of my receipts frrom my employer except I-140. When I called my employer regarding the I-140 receipt, they said it will be sent to me once my lawyer receive it.
Folks,
140 is filed by the employer and as far as i know, they retain the receipt . I140 is really an employer's petition and they hold the right to retain the receipt. one generally gets the 485/756/AP receipts ...
Even in my case, I did not receive the 140 receipt and my 140 got approved recently