beishidashuo, send them immediately your POF by actual mail.
Send them exactly what you sent through email, writing an explanation letter on why you thought it was appropriate to send copies only by email (since they never really asked for "originals"), and also account activity of the same bank accounts you sent for the past two months (assuming, of course, these accounts have all been healthy the past two months).
In the mean time, immediately write them through email, asking them if they have received your email with POF from two months ago.
Also, from your post history, you were one of those people who appealed to Sydney for the 5 adaptability points for previous study last year. Keep us updated on you case, and also order CAIPS notes to shed some light on exactly what's happening on your application. Good luck