Special Delivery Box

Next to your Market Stand you'll find the Special Delivery Box. You can send gifts to 100 friends and the gifts are randomized.

Tips:
Go back to the Special Delivery Box later on in the game, and you might be able to send more gifts than the initial 100.
Don't harvest the Special Delivery Box until you're sure you have room for additional items, such as salt, sugar and water.
The Special Delivery Box can only hold a maximum of 15 gifts so you need to empty it when it reaches that number.