Send three and fourpence, we're going to a dance!
In other words, how does you posting your somewhat vague version of what your son has told you add value to the process, compared to him posting here first hand?
Beyond general bailiff advice (which I stay out of), the devil is generally in the detail and to be blunt, there is none in your post.
If you are going to post about the police sending "the forms" to the wrong address, you are basically wasting our time and your own.
To the best of your son's knowledge, what notices were sent to, or received at what addresses and when?