I'm sorry to hear your order arrived with the box open. I can certainly understand why that would leave you wondering about the condition of the filter.
While we don't include paper invoices in our shipments, your filter should always arrive in new, unused condition. If you have any concerns about the filter you received or believe it may have been damaged or tampered with during shipping, please contact our Customer Care team by phone or chat. We'd be happy to review the shipment and make it right if needed.
Thank you for taking the time to share your feedback. We appreciate the opportunity to help.