Solution
A Feathery Vanishing Act
Both Leo and Raven guarantee that the only way the thief could get in was through the smashed window… because the shop was locked.
If this is the case, Leo could not have seen the thief flee out of the front door without unlocking it first, which couldn’t be done with the keys being off the property.
With this fatal flaw in his story. Mogau knows that Leo was the one to steal The Puffinbill Parrot Plumes