Upon arriving home,I was surprised to find the papers I had

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Upon arriving home,I was surprised to find the papers I had had ______ was missing.
A.to collect B.collected C.it collected D.to be collected
请详细说出理由.thanks!

I had had ______ 是定语从句, 前面省去了个that
即：（that) I had had 【collected】
that 这个关系代词代先行词the papers, 作had had（have这个使役动词的过去完成时）的宾语：
可见：此句型为：
have sth done
collected 是过去分词做宾补, 表被动
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再问：能告诉我这句话的完整意思吗？thanks！！！
再答：一到家，我惊讶地发现我所收集的文件全不翼而飞了。

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