I think il just leave it un-signed and keep hold of it for now then and see what happens, if i get a phonecall or a knock on the door then il just say i forgot about it and then sign and return it, theres nothing on it to say it has to be returned within 7 days or anything like that.
I think this is just an easy way of them giving me a punishment because they know their evidence would be worthless in court.