The problem is I don't know which files were the ones 
that were incomplete - I didn't note them down prior to 
cancelling then restarting the grab process (I assumed 
incorrectly that the program would either discard the 
half downloaded files and restart it upon the option of 
resuming corrupted download, or else pick up where it 
left)...

Does this mean I will have to manually go through all 
2500 files to look for the ones that were incomplete, 
or else just re-download everything?