EA assessment; No third Party Doc ; Please Advice

Hello. I am planning for EA assessment.At my initial Job, I was paid with cash and I dont have any tax papers(as it wasn't taxable) and no relevant Bank documents. What else i can present to EA to claim this experience? Kindly advice.
1- Salary Certificates 2- Salary Slips 3- Letter From employer with mentioning of your income tax exempted income also if there you can get something relevant from the Tax office 4- Promotion / Job Contract letters 5- Job Relieve letters 6- Any paid training or sponsored training your employers offered you during your job . Please attach certificates reflecting those training and any expenses made by your employer for travelling or hotel stay etc.