Once he started sketching out his long-range vision for the museum, Chang Yi-hsien no longer resold all of the precious shells that came into his possession. Instead he saved the most beautiful and excellently shaped samples for his museum collection. He owns the largest and most flawless Joyce's cowrie shell in the world. Though a collector offered him US $ 15,000 for it, he refused to sell.
自從描畫出籌建寶貝館的遠景，張議顯不再將到手的珍希貝殼統統轉賣變現，而會留下一只品相最美、體型最佳的標本充實館藏；目前在他手中就藏有一顆全世界最大又完美無傷的柔姬寶螺，儘管已有藏家向他出價 1 萬 5,000 元美金（約台幣 49 萬元），但他還是捨不得割愛。