Copy Data from different sheets weekly into a master list with data of the whole year

I hoped some experts here can help me with this.

We have folders of daily cash collections stored in such a manner, year\month. In every month, we will have worksheets sent by the end user to the finance dept, naming it using mmdd. (The folder in the drive will reads: C:\Daily Cash Collection\2013), (C:\Daily Cash Collection\2013\0104.xlxs), (C:\Daily Cash Collection\2013\0115.xlxs). I intend to put the master list outside the year folder, meaning, in the Daily Cash Collection folder (C:\Daily Cash Collection\DCC_2013.xlsm). When I have a new folder for year 2014, my master list will be here (C:\Daily Cash Collection\DCC_2014.xlsm)

I am looking to automate this opening of all the daily worksheets, select all data except the header row, and copy it into a master list (which will be data for the whole year, with 3 months of the previous year data).

The data in the daily sheets, it will have collections of the same Debit Note number from the file sent earlier. Meaning, if the file was sent on 0104, there is a DN0114-0002, collection of $50. In another daily sheets 0115, it will also have a collection of DN0114-0002 of $20. This 2nd information of $20 will also need to be captured as the payment in 0301 is partial and incomplete.

I will need to copy the daily sheets into the master list every now and then. Is there a way to check and copy the daily sheets and not repeating it and missed out one?

In another words, if I had already copied Jan sheets into the master list, will it look for the next worksheet that I had not copy and copy according the DN number? (it will be in running number but sometimes will have DN of the previous month due to the partial payment ealier).

Alternatively, if this is too complicated, how to insert a macro to copy all cells except the header (will be in fixed column and the first row will be fixed) from an open daily sheet, find the last row in the master list and copy it to the master list, and after copying, unclear the selection of the daily sheet and close the daily? Where can I put this macro as the daily sheet is from the end user. I can only put it into my master list, but my problem is, the file name of the daily sheet is not fixed, it depends on the day the end user saved and email the data to Finance Dept.

DCC foler.jpg