Because at the end of the year the students get them back.
It's possible that someone else discovered the items in the knot-hole and took them, or the items were removed or destroyed by an animal or the elements. Additionally, the person who originally placed the items in the knot-hole may have decided to retrieve them for some reason.
The items are left in the knothole during the school year because the kids who leave them there are typically students who are attending school regularly. When school is not in session, there are fewer opportunities for the students to leave items in the knothole.
Items are left in the knot-hole only during the school year because Scout and Jem find the gifts in the tree on their walks home from school. They likely wouldn't have the opportunity to check the tree regularly when school is out during the summer.
Boo puts them there to please the children
Other symbols in "To Kill a Mockingbird" include the Radley house, which represents isolation and mystery; the tree outside the Radley house where items are left by Boo Radley, symbolizing communication and connection; and the mad dog, which symbolizes the destructive nature of racism and prejudice in the town.
what is this knot over my eye on my forehead
sleeping unusually or constant pressure in that one spot
The impact hole left in the Earth or any planet would be a crater.
The impact hole left in the Earth or any planet would be a crater.
The children find small gifts in the knothole of the tree, including two carved soap figures that resemble them, a pack of gum, and shiny pennies. These gifts are left by Boo Radley, who is trying to reach out to the children in a secretive way.
Jem and Scout discovered that someone had filled the knot hole with cement, sealing off the opening where gifts had previously been left for them by Boo Radley. This action by Nathan Radley signified the end of their secret communication with Boo.
Nathan Radley claims he is filling the knot hole in the tree with cement to protect the children from any future presents being left for them. However, his true motive may be to prevent Boo Radley from communicating with Scout and Jem.