Identity Theft

I've been a victim of identify theft twice in the past twenty years. The last time about a year and a half ago. Someone made a purchase from an online clothing store which appears to be targeted toward the young crowd. Made purchases of about $500. I notified the CC company and they investigated. Turns out the items were delivered to my doorstep and signed for in the afternoon when I wasn't home! (BTW, I don't have children.) And the signature was not in my name. The CC company thankfully forgave the charge....thankfully 'cause it made me look as guilty as h*ll. Since then I upped the security on my computer and home network. Have no idea what happened.