引っ越しのとき、子どもの頃の思い出の品をいくつか見つけた。
When moving, I found several mementos from my childhood.
記念品 is a more formal term for a commemorative item or souvenir, often given at events, whereas 思い出の品 is personal and emotionally charged.
Compound of 思い出 (memory, recollection) + の (possessive particle) + 品 (item, article). The phrase is transparent and follows standard Japanese compounding patterns.