It''s past time to say something, both about the cubicle and the secretarial duties.
But here''s the thing, don''t ever go in with a problem without a solution.
So the problem:
1. You are in a cubicle and it gives the appearance of being a secretary.
2. Because of where you sit, and your willingness to do scut work, the impression has become that ALL of the scut work should fall to you, and in fact, people new to the office often think you are a secretary.
Ideally, your own office (the next time one becomes available - the cube should always go to the new person) and an equitable distribution of scut work, e.g. everyone should be responsible for their own filing or the duties should be divied up and shared (e.g. in my job, we have a daily roster that the team lead puts together and all the crap jobs are divided up amongst us, so some days I do none, some days I do one thing, some days another on an ever rotating basis).
Point to where your performance shows you are on par with your colleagues but sadly the office situation plus the extra stuff is giving the appearance to many that you aren''t. Say you were just going to live with it when you thought the new office was imminent but now that it looks delayed, well, the status quo is uncomfortable for you and you''d like a little consideration.
Good luck! Quality of life at work is important. You don''t get graded, it''s not school, you don''t get rewarded without asking.