employment verification? you mean employment letter from the company? Is that a must?? because I didn't see employment verification is a required evidence on the i-864 instruction.
Its not mentioned but at least here in Houston the DAO (District Adjudication Officers) who will be conducting the interview where ever you are at your local immigration office most always will ask for it, i.e. the employment verification letter thats on company letterhead, states your position, length of employment, salary, etc.