1) I've seen that you sent me some documents. = I have just seen that you sent me documents in the past.
2) I saw that you have sent me some documents. (Technically wrong. But I think some people may say it.) I saw (at a certain point in the past) that you have sent me (more than once) documents.
3) I saw that you had sent me some documents. = 2
4) I've seen that you have sent me some documents. = I've just seen that you've just sent me documents (very recent actions) or I've seen several times that you have sent me documents several times and I know you might send more.
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