Lost property Missing X

Hi,

I left my son's rucksack on a SW Trains train in May 2019 - the Missing X site seems to have found it - ie the rucksack has been registered on the site.

But no rucksack can be found at SW Trains Lost Property. it's nearly 3 weeks ago.

Why is this?

How do we check who inputted the information onto the Missing X website.