iPhone found message

My wife iPhone has been stolen, I was able to block it inserting my number in the recall message and to call the police. The thief has been arrested but the phone was lost. Last week I received three messages from +44786013080

I ignored them.

Today I received a new message with the same content, but from Apple. I can't see the number, but it's associated with an old Apple name I have in my addressbook.

Then I tried the website (without typing anything) and it brings me to iCloud, the site certificate seems right.

Is it a real message from Apple? I think not but better ask

Ivan