Old Galactic Market
After entering the Shipping And Receiving area in the market, head left. Ignore the first lift (which is broken) and instead go up the ramp. At the top of the ramp, turn right and take that lift upstairs. Directly across the platform is the cube, guarded by an elite and his friends.
Black Sun Market
Once the Silent Sun Cantina has been reached, go back up the stairs. At the top, across the room, is a mountainous stack of crates. Climb to the top and jump across the pipe to the catwalk. Continue to follow the catwalk, jump across the broken section, and continue to follow the wall until it dead-ends. There wil be a sign that overhangs another catwalk below. Walk out on top of the sign and drop down onto this second catwalk. The datacron is right at the edge.
This datacron is within Justicar Territory. On a platform high above the ground floor, in the northern part of the map. There are boxes and crates stacked against the wall, climb these to the top. At the summit is a series of three pipes that untimately lead to a large arch against the far wall. Cross over this arch to yet another pipe and follow that to the platform with the datacron on top of a crate.
Reward: Cunning +2
Located at the Primary Coupling Station within the Works. You must travel another long distance across pipes. Work your way to the end of Pipeworks Passage to begin. There will be some boxes near a large pipe that need to be climbed up. Once on top of the pipe, follow it into the next two rooms. Once in the area named Upper Power Distribution, turn left and jump across to the next series of pipes against the wall. Follow them up and around to the section of wall that juts out. From there, jump across to the other jutting wall piece.
Reward: Yellow Matrix Shard
Ruined Jedi Temple
Travelling to the Jedi Temple by taxi is the only way to reach it. Enter the temple and move ahead until reaching the destroyed courtyard. Follow the map counter-clockwise around until a fallen column comes in to view. Go up this column to the second floor and then continue to travel counter-clockwise around the mezzanine. A Champion level sith named Anev Xydes will be meditating on the correct balcony, but is far enough away to slip past. The broken support beam jutting out from under the balcony has the datacron at its tip.