View Deleted Messages is the best app to read messages and media attachments from WhatsApp and Facebook Messenger without showing any notification.

Download and install the app from Google Play Store.

To start using the app, open it and connect your WhatsApp or Facebook Messenger account.

Click on the "Messages" tab and you will see all your conversations with all your contacts. You can also see media (images, videos, audio) attached to your messages.

Click on the "View Deleted Messages" tab. You will see all the messages and media that you received and that have been deleted by your friend. To read them, just click on the message and it will appear in the conversation list.