Hi Fleity89
Congratulations on making it to the final interview!
I was in exactly the same situation that you are in, I handed in all my documents at the final interview except my proof of employment. I emailed it to them within the next few days and I too didn't get any feedback confirming that they received it. But as long as you sent it to the correct address you have nothing to worry about. If there's anything that they require of you, they will get in touch with you. So just wait for your Golden Call and relax
Easier said than done I know!
Good Luck