i need help can i find out what device request a password reset.

I dont check my email very often and when i did i had a email from apple saying how do i rest my password. they sent it to me on 8/15/13 at 2:30pm. also i went to my icloud account and noticed i only have 1 ipod and my sons iphone registered. i did have 2 ipods and my sons iphone. so i need some help finding out if i can get that email tracked back to the device. Also i had another email from 7/9/13.

Your Apple ID, was just used to download Paper Run from the App Store on a computer or device that had not previously been associated with that Apple ID. You may also be receiving this email if you reset your password since your last purchase. that is what the 2nd email said. so now i am worried. if anyone can help lead me in the right derection. thank you