Letters on M10

Lawrenceville posted a video of envelopes on their Instagram (lvilleadmissions) with a caption that suggests that they are letters for accepted applicants. I wasn’t aware they sent letters, and thought the decision was only though the portal. Does anyone know exactly who the letters are for (accepted, rejected/waitlisted) and if they will arrive on M10 or after?

Everyone gets a decision online AND everyone gets the same decision sent by mail as well. However, for accepted applicants, the decision that is sent by mail is typically in the form of a packet sent via FedEx, UPS, or similar service.