Okay, this is what I've been able to come up with.
Pick #29 was originally Speedygose's 2nd which I acquired in the Darvish, Rendon, Russell deal. 2nd rounder's that I have moved were my own and #37. So I don't believe I traded it away.
Hurl received Pick #29 from Spanky in a deal for Moya.
According to the trade history sheet Spanky acquired three 2nd rounders... Silverguns 2nd, plus two 2nd rounders from Dinger, can't find out who's they were.
Pick #36 is missing in the Google doc, which was originally Silvergun's 2nd.
So, from what I could find, it seems that Silvergun's 2nd that Spanky owned was somehow switched to #29 instead of the #36 it should have been (lol bts?)
Edit: #76 is also missing from the sheet...