A day of hiking

You decided to go for a hike in the forest. After hiking for a few hours, you notice the forest has changed. The walking trail has become narrow. Ancient trees loom overhead, their branches knitting together to block out much of the sky. The path beneath your feet is worn smooth, as if countless travelers once passed this way — though none seem to do so now. A faint breeze rustle through the trees.

Up ahead you notice an old mailbox, with the lid open. You walk towards it and can see there is something inside.