Surgical (e.g., dental) implants do not have serial or lot numbers on them. They only have a part number. The packaging has a lot number, with which the manufacturer can reach out to a patient if there is an issue.
While watching Beckett interrogate McManus with Gates, at one point Castle comments "She's just trying to get through to him any way he can" instead of "...any way she can".
Added by HN - Castle actually says the words "anyway YOU can."