Auto-accepted files should definitely be placed in a seperate folder so you cound easily see what has been recieved while you were away. If they were placed in My recieved files (where I have a ton of files already) it would be harder to notice.
Another option would be for Plus to display a "welcome back" message.
Dear user. Welcome back! Plus! has auto-accepted the following files while you were away:
xxx.mp3
xxx.jpg
Anyway, you get the picture