There are two parts to the snitch list: one part is hidden in the work pass room where there are the two guards and the mechanic. Search for a loose panel behind the crates. After you give the package to Jagger Valance and getting the mission to get the bomb, return to the second floor as if you are going to the upper mines. On your way back you will encounter two miners standing around. Kill them. One of them has the second part of the snitch list.