The chance of EC's dropping is 2% from any job, it doesn't matter which job you do or if you have completed it already. The chance of DN's dropping is far lower, I've only ever had 2 drop in 22k jobs.
Jobs you've already completed do drop dn. Just very rarely. You have a better chance if farming ec from just to get 15 ec and just use those as your dn then getting the actual dn drops.
I got 1 dr.note someone send the new gifts I cant send the new gifts but I can send the old gifts like lollipop,Tissue all that