That sounds ridiculous!! Unless you were leaving weeks of mail in your box there was no reason for her to think you were not living there. The things you mention may have caused her to wonder, but as long as you were picking up your mail, it shouldn't have mattered, especially since you left her the note!! Wow! Keep us posted. I do think the PO should be responsible for any late fees and straightening things out with your creditors as some will raise your interest rates drastically for one late payment.