What is the use of Key:0303?

Question

I have this key on my backpack but i dont remember where i take it and what door it open, i know is from cobra bastion 

Answer 1

It opens several doors in the Cobra Bastion, but it can't be used to close them back.

Found inside a skeleton, here.

Source: Key 0303 (Tibia Fandom)

Answer 2

as long as i know , this key is to open the door west of the scarlet.

and you can obtain this key in the gaffirs floor , just walk to north and open the skeleton, greatings :D

Answer 3

The golden key (Key:0303) opens all the doors that can be locked at the Cobra bastion.

You can find it inside a skeleton in a treasure room at the north of the +3 floor of Cobra Bastion (the same floor where Gaffir respawns).

Here:

 

When you use the skeleton you get a bag that contains the key and a parchment. You can take this key every 24 hours.