So Davin is theoretically working on his job and available for orders of hard-to-find things should any Spades need to request them. But that doesn't mean he has to be in his office to do paperwork, does it? So instead he can be found in a corner booth in the Four Suits with an Irish coffee beside his work and the remains of lunch pushed off to the side of the table.
He's open for business.
Or relatives.
Or
conversation in general.
And yes, he did leave a note on his office door detailing where he could be found.