The lack of a reward and the larger size of the letters does suggest to Aldrich that he replied with the wrong passphrase, so he's stuck with something that he doesn't know what to do with and hasn't passed along the incriminating letter either.  For the moment there are enough problems that this can be sorted out later.<br/><br/>Besides, a quick visit to the town hall for a key to Goblinwatch would make clearing it out easier and that is where Portello went just a few minutes ago...