5th document is the photocopy of your Citibank CC. i don't see myself using it for 3.5 L at all. just for the initial bonus i will take it though since it comes free :P
he just called again to confirm the evening visit, and i asked him for the 5th document. was the address proof i had forgotten . anyway, i dont need to worry, have a copier at home and all the documents are also at home. he did not mention the card copy, just the card statement