Okay this is Kid's POV.
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Underneath the Moon
Clutching the Hope Diamont, Kid admired the magnificence of the gem. The Hope Diamond was one of the largest diamonds of its kind in the world, the necklace it was set in making it appear bigger than it already was Kid decided. The Hope Diamond was worth at least estimated to be $200,000,000 - $250,000,000 (1) but the cost and wealth the diamond could gain didn't matter to Kid. All that mattered was if it was in fact Pandora. If the gem wasn't Pandora then it would be returned but if it was then nothing would stop him from destroying it.
At least that had been the plan. Now though, after four years of looking and one year after the B.O. having been destroyed his plans for the jewel was different. In one month the comet that supposibly causes Pandora to cry would enter the atmosphere and show up. If the Hope Diamond really is Pandora he intended to use it and then maybe destroy it.
As the clouds moved out of the moon's visage allowing the moonlight to escape he held the jewel to the moon. Red light appeared around him allowing him to see that inside the diamond there was indeed another gem inside. Pandora was in his hands.
Grinning in delight at his find Kid started making preparations for the next month. Kaito would have to hide the gem and insure that no one took it but Kid had faith that that could be done. After all he had never been caught yet, even when he invited the task force to his heist, so what hope would anyone have in stealing the diamond from his home turf?
And now Kid had the prospect of staying with his beloved Tantei-kun, just like Kaito could remain with Shinichi.
Of course he didn't really know if Pandora really did give eternal life and until that was 'tested' all plans would have to remain a secret, especially from Tantei-kun.
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(1) I actually did research this. And it really is an estimate on how much the Hope Diamond really is.
I guess that its bound to happen here but I firmly believe that yes Kaito is Kid but he thinks and acts as though Kid is another person. Kid in turn 'thinks' for 'himself' and acts as though Kaito is the mask. Basically it's Kaito thinking of himself as two different people and in this drabble he's currently Kid.