AW does keep track of your IP address, so for example if you borrow a friends PC and genuinely log in to AW, then you get an email from them along the lines of "Log in from new device or location. Was this you? If not, change your password."
If you genuinely cant find anything back in your email trail (I'm presuming you have a punting email totally different from your emails), then I don't see much choice but to go for a new device.
Certainly stay away from Viva street!!