You can only provide what you have got. Keep calm. If the CO wants anything else relating to the time abroad, such as, for example, letters from family and neighbours, s/he will tell you.
If you are asked for more evidence, in most cases INZ want originals or certified copies.
Don't worry if the CO asks for more evidence from now. It is normal that they ask for more, covering the time of application, just before a visa is issued. This is to try to ensure that they aren't issuing a visa to someone whose relationship has broken up in the meantime.