At least some content in this article is derived from information featured in Fantastic Beasts: Cases from the Wizarding World. Spoilers will be present within the article.
- Mathilda Grimblehawk: "Thanks for the info! This will all go into our report… Which is back at the police station… Which is definitely where we work."
- Sara Farnham: "Oh… Good. Do I get an incident number or something?"
- Mathilda Grimblehawk: "Of course! Your incident number is… four? Sorry, must dash!"
- — Mathilda Grimblehawk questions Sara Farnham[src]
An incident number is a reference number used by police when officially recording a particular crime.
When investigating Bilius Finbok's disappearance, Ministry of Magic investigators Mathilda Grimblehawk and her partner posed as a Muggle police officer and inspector, respectively, when questioning Finbok's Muggle neighbour Sara Farnham. When they had collected sufficient testimony, Farnham asked for the case's incident number; a confused Grimblehawk tentatively answered "four" before leaving in a hurry.
- Fantastic Beasts: Cases from the Wizarding World (Mentioned only)