Hello. Does it still have your current Google account. Can you install your sim card back and turn it on. Unfortunately you can't drag files to a pc while the screen is locked, so the only possibility is to Lock it, again, with Android Device Manager, hoping ADM is still enabled in the Security Settings.
When you Lock a device on your Google account with Google's Android Device Manager, this Lock command with a new pin or password overrides the old screen lock.
Your Google account, your device.
You don't need to have Location enabled on it, so 'Locate' won't 'find' it, but with a sim or wifi signal the ADM command usually gets through. You can put a "please return me" type message and a contact number on the lock screen as well, as if you had genuinely lost it.