The perfect crime is one that never sees the light of day. Anything else is merely a skillful crime.
When you first ordered Cen to gather as many valuables from the Jedi Temple as she could, you assumed that she would steal everything with Sole running interference. After which a few smugglers would take the artifacts to your force order, followed by Isaard's immense anger at having been robbed. Of course, your intelligence agency continues to surpass expectations, a repeated pattern that you will have to correct.
Rather than a simple robbery, Agent Sole suggested a more complicated scheme, which Cen approved of and immediately made changes. Over the course of two months, the Empire under Isard turned the Jedi Temple into a symbol of power that every high-ranking officer or politician under her command could visit. It demonstrated her power, here were the artifacts of the once-mighty Jedi order, and she was the one that determined who could gaze upon them. Of course, such an exhibit came with security flaws, and so Agent Sole convinced Isard that the real artifacts should be stored in a secure location, with the ones in the Temple itself merely replicas.
And Agent Sole used Empire of the Hand spies to transport the real artifacts while going over budget on the replicas to make two copies of everything instead of one. Of course, Isard paid for it, along with the transport costs as well as the costs to create your own vault. It is a remarkable failure of intelligence for her empire, or perhaps it may better be described as a remarkable success of intelligence for her empire. Of course, her empire's intelligence is run by your agents, so it's not much better to think of it that way.
And now, the entirety of the Jedi Temple's holdings are yours. Within a large vault near your force order, guarded by your own soldiers, of course, are a wondrous assortment of artifacts. Holocrons in the thousands, both Jedi and Sith, with the caveat that the most recent Holocrons were recovered from Palpatine's stashes rather than the temple, a massive archive with more data than can be found anywhere else, and of course Kuiber crystals, enough to make ten Death Stars.
The Holocrons will accelerate the growth of your force order by nearly four-fold according to Kanuas, along with increasing how much he can train them. But that's secondary to the archives. Oh, how many opportunities were just opened to you. Full topographical maps of every inhabited planet, complete hyperspace maps of every known system, and a survey of planets in the Unknown Regions. To say this is an opportunity is to disparage how utterly game-changing it is. No, this is twenty opportunities bundled into one. The only question you have is how much you should allow Isard to have.
[] None - Sole shall delete everything and replace it with junk data before beginning his extraction, for this will be discovered. *Lose T5 spy ring in the Empire next turn. Locked action to extract Sole and blame another faction next turn.*
[] Let them keep the data on known systems - Sole shall delete the information on the Unknown Regions but let the Empire have everything else. Until Isard sends an expedition to them, she will never know what you have managed. *Isard loses access to maps of the Unknown Regions. If she tries to make use of them, it will be a disaster and Sole will need to escape.*
[] Let them have all of it - Sole shall do nothing with it, ensuring his security while letting Isard retain her advantages. This has no risk, and would keep his cover, but does nothing to curtail the information held by the Empire. *Status quo.*
