How do open my father's chest

Hint 1 of 8:

(Referring to the one underneath the tablecloth, of course)

Hint 2 of 8:

Have you found the key yet?

Hint 3 of 8:

You need to pull down one of the bookcases.

Hint 4 of 8:

There's a piece of tape stuck on it.

Hint 5 of 8:

You need something to get the key out of the tape.

Hint 6 of 8:

Look around your office.

Hint 7 of 8:

There's a jar of solvent there.

Hint 8 of 8:

Put the tape in there, and use the key to unlock the chest.