You took a job performing manual labor -- did you perform this work as an employee, with deductions made for unemployment, disability insurance, taxes, and the like? You say you have payroll checks, and that you can show your receipt of pay ending some three weeks before your accident, but you also claim that you worked during those three weeks including on the date of your accident. Why don't you have records for those three weeks?
In any event, given your update, perhaps none of this will be an issue.

