I am fortunate that my grandmother kept it intact in her attic until I discovered it two years ago.

intact 是由前缀 in-（表示"不、没有"）和形容词 tact（来自拉丁语 tactus，意为"触碰"）组成，字面意思是"未被触碰过的"，引申为"完好无损的、完整的"。