If you are like us, you may have gotten a message yesterday saying that "Wallet activated on a new device" even though, you most likely hadn't done anything of the sort. Google sends out these messages to help users protect against theft, so receiving a message like that can be disconcerting, but it turns out that a number of users got that message in error...
Source: http://www.phonearena.com/news/Google-accidentally-sends-out-Wallet-activated-on-a-new-device-messages_id46417
Source: http://www.phonearena.com/news/Google-accidentally-sends-out-Wallet-activated-on-a-new-device-messages_id46417