The Best Christmas Present in the World (Part - 1) is a story written by Michael Morpurgo. In this story, the main character finds an old desk that has been damaged. The cause of the damage is not explicitly mentioned in the text, but we can infer a few possibilities based on the context and clues provided.

Possible Causes of the Damage:

1. Age and Neglect: The desk is described as being old and dusty, suggesting that it may have been neglected for a long time. Over time, natural wear and tear could have led to the damage.

2. War and Conflict: The story is set during World War I, a time of great turmoil and destruction. It is possible that the desk was damaged during the war, either through bombings, shelling, or general chaos.

3. Poor Storage Conditions: The desk is found in a dusty attic, which implies that it may have been stored in less than ideal conditions. Exposure to moisture, pests, or extreme temperatures could have caused the damage.

Significance of the Damaged Desk:

The damaged desk serves as a symbol in the story, representing the forgotten history of the soldiers who fought in World War I. It becomes a key element in the narrative, connecting the past and present.

1. Historical Context: The damaged desk is a tangible artifact from the past, reminding us of the sacrifices made by soldiers during the war. It highlights the importance of remembering and honoring their contributions.

2. Emotional Connection: The main character, Jim, becomes emotionally invested in the desk and its history. He feels a sense of responsibility to restore it and find its rightful owner, which drives the plot forward.

3. Themes of Remembrance and Reconciliation: The damaged desk represents the need for remembrance and reconciliation. It prompts the characters and readers to reflect on the past, learn from it, and work towards a more peaceful future.

In conclusion, the exact cause of the damage to the desk in "The Best Christmas Present in the World (Part - 1)" is not explicitly stated. However, possible reasons could include age and neglect, war and conflict, or poor storage conditions. The damaged desk serves as a significant symbol in the story, representing the forgotten history of World War I and emphasizing the themes of remembrance and reconciliation.

The author found and bought the desk in the past. The desk was damaged before the author found it and bought it. Fire and water had damaged the desk before the author found it and bought it.