I currently hold a work permit in US and am employed by a major Bank via an agency. Recently, I received an offer of employment directly from the bank. I have passed my background check, my education check and am now in the final, past employment check stage. Aside from references, the agency requested some documentations to prove my employment. For one of my past jobs, I know I will not be able to provide such documentations for a number of reasons, including the fact that I have not brought any of such documentations with me and I do not have anyone in my home country to take care of this. That is aside from the fact that there is a conflict going on there too. However, I can provide all the proof from my current employer and the rest of my past employers.
What should I do in this case? Considering I can still provide a contact reference for the company (who, unfortunately, is no longer with the company as well) but nothing else. How should I justify my answer?
P.S. they want this done in less than a week too.