How do I open the coffin?

Hint 1 of 14:

Did you examine the painting?

Hint 2 of 14:

The objects in the painting should be familiar.

Hint 3 of 14:

The sceptre, have you found it?

Hint 4 of 14:

It is back in Meldrew Hall.

Hint 5 of 14:

In the umbrella stand in the White Hallway.