Most VCS (Version Control Systems, or revision control, or whatever you want to call them) keep track of who made a commit. Git allows each user to configure a username, and an email address. Each git commit records the commit's author.

I can't imagine a website with 350 files not using version control in 2012, so you probably just need to look at your commit history, and therein you'll find your answer. You are using version control, aren't you?