How do I use Automator to add files download via Transmission to iTunes?

Here's the setup… Computer A - Running Transmission - placing files in a Dropbox folder - Uses iTunes Match to load music from Computer B's iTunes library - Is always running Computer B - Shares Dropbox folder with Computer A - Is "master" computer for iTunes Match account - Is not always running Current process 1. Download files via transmission to dropbox folder 2. Start computer B, wait for dropbox folder to synchronize 3. Copy files to "Automatically Added to iTunes folder" What I want is to have a folder action that when Computer B sees new files in the dropbox folder it will wait till all file transfers are complete, then copy just the new files into **"Automatically added to iTunes"** All of my current tries have caused Automator to re-add all files in the dropbox folder to iTunes, creating duplicates. One limitation to be aware of — unaltered versions of the files must stay in the dropbox folder.