How can I get the boucassier's feather?

Hint 1 of 12:

You first need to find something to attract the boucassier.

Hint 2 of 12:

Look in the store for that item.

Hint 3 of 12:

You will first need to read the hints in the store section to figure out how
to open all of those locked cabinets.  Once you do, you should find a decoy
in the "storage cabinet."

Hint 4 of 12:

The decoy won't make noise on its own -- you need to hit it against
something.

Hint 5 of 12:

Try hitting it against the bell.