In The Silver Sword, who gave Jan the wooden box with his name burned into it?

Jan received the new wooden box from Ivan, a Russian soldier who worked at a command post in Warsaw. Ruth took Jan in after she found him in a desperate state. Jan introduced himself and Ruth helped him recuperate in the shelter. Jan later met Ivan, who was delivering supplies for the children. He confronted the soldier because of his hatred towards them. A scuffle ensued between Jan and Ivan and after Ruth calmed Jan down the boy noticed that his wooden box was broken in the brawl. Ivan delivered the supplies and informed Ruth of Edek, who was held in Posen. The children decided to travel to Posen to locate Edek. Ivan provided them with shoes and gave Jan a new wooden box that he had made to replace the broken one.