没有几张被兑换过有传言说装着债券的箱子当时被截获了还有一大部分仍藏在阿尔塔米拉洞窟里
Very few have ever been redeemed . There 's speculation that entire boxes were captured and many of them are still hidden away in the caves of Altamira .
阿尔塔米拉洞窟