Analytics captures

My original website was set up with Google Analytics some years ago. I recently (a few months back) redesigned the site in WordPress and placed my Analytics code in the new site in the template footer. The code itself no longer seems to be appearing in any of my WordPress files – I’ve gone through all of them as well as the database – no sign of Analytics code that I can find. But Google Analytics seems to continue to report – though it doesn’t seem to be reporting known/confirmed visits. Can anyone offer some guidance? Thoughts? Suggestions?

I’m thinking of just adding a Google Analytics plugin to the new site but am concerned about it conflicting with some unknown.

Any thoughts?

Thank you!