What is that one item?

I'm very good at my job 

And I know the collector who bought the last celebration thomas that came up for sale.


And with the powerful gordon box Muddy, good luck:



Suppose for the one item that I've always wanted, it would have to be a Boxed Donald and Douglas Snow Plough Set


Or a BNIB Tomy Motor Road and Rail Oliver



An honourable mention would definitely have to be a BNIB, or Boxed Tomy Thomas, Percy and the Chinese Dragon Set