Limbert wanted you to grab a Potion Box from the Attic, and you accidentally uncovered a stack of letters while doing so. You showed them to Limbert, but it seemed to make him mad.
Limbert thinks you're a lazy, no-good bum for standing around while a display stand is empty. He's one to talk. Anyway, he ordered you to grab a Potion Box from the Attic. Better do it before he gets even angrier. Look for the box with a picture of a potion on it.