What objects changed locations

Hint 1 of 5:

Decanter (from parlor to Fifi's room).

Hint 2 of 5:

Derringer (from case in study to hedge garden).

Hint 3 of 5:

Doctor's bag (from Wilbur's room to Henri's room).

Hint 4 of 5:

The dagger (from the cabinet in the study to Clarence's chest).

Hint 5 of 5:

The roses for Fifi don't count, I guess.