NHS lost my 650 new phone

I recently had to got hospital for mental health issues and the ambulance crew asked if I hady so my partner put my phoney keys and a few bits in a canvas bag and handed it over the the crew however when I got out noone had my phone and keys. Not a and e, now the ward or the hospital I was transferred to. What e my rights . Everyone seems to be brushing it off as 'theae things happen' but no I just saved fprronths for my new phone what can I do about it?