Bard guild key

Maeveto Bard Aragorn, friend of the Greenwood

I found the Bards GM key in Theseus's palace, and immediately checked to see who was the Bards GM, intending to leave them a message informing them of this - but no GM was listed. I enquired of two gods who were on at that time whether the Bards had a GM, and was told they did not, so I decided to hold on to the key until a GM was appointed. I took a look in the guild, found the outer doors locked, but the inner ones open, so I locked them all before leaving. I saw nothing within the guild at that time but the tutor and a couple of warhorses - I didn't check if the tutor was holding anything.

How come you can use MEMBERS RETRIEVE, when you are not the GM?