I don’t have an implant, but I have purchased at times copper and metal shirt collar stays.

Once after falling on ice, I had a chest x ray where my shirt was unbuttoned but didn’t need to be removed.

A very anxious tech came to me a few minutes later asking if I had been wounded when I fell, if there was something embedded in me, etc.

Very quickly figured it out when shown the images.

Incredibly comical, and obviously not an issue. (Nor related to implants)