I am surprised that the number is said as active.
Because when I ran it this morning before calling the UK police, it triggered an automatic message by my carrier that the number doesn't exist.
I also ran it through Whatsapp and it has no account linked to it, dixit Whatsapp.
Maybe it didn't work with a French number, but works with another country code. It's a question, nothing certain about it.
However, I had once the problem when my friend's number was a Whatsapp account, but their system didn't recognise as a Whatsapp account.
My number is a French number, so if a sleuther of another country code could run the number on their own Whatsapp and tell me if it worked, it would be wonderful!
You can run this check without storing the number in your contact:
WhatsApp FAQ - Seeing your phone number already in WhatsApp
Adding 2 screenshot. If you get a green tick, it means that the number is a valid Whatsapp account. The valid number I took to show is of a Colombia pharmacy chain called Farmatodo Colombia:
Farmacia y droguería online 24 horas a domicilio - Farmatodo and on the left menu, you choose "Contactenos" (in Spanish).
I know that Farmatodo has
nothing to do with the case. However, I wanted to show you how a valid Whatsapp account looks like when you run it without storing it, and I prefer using a public number of a company customer service rather than one of my personal contacts. My personal contact would not appreciate seeing their number publicly on display about a high profile criminal case when said person has absolutely nothing to do with it, shape, form, color, whatever you want!
1) Running the key witness released by police for checking through Whatsapp without storing it
2) What does a valid Whatsapp number looks like when you check
3) What looks like Farmatodo's contact page
I can run it again and record the automatic message by my carrier (in French) if you want to.