Sean Knight and Lincoln Harrington, along with William Smith and others, had completed their trade and paid William Smith his compensation. Then, they took an airplane and left Rome for Paris.
Sean Knight's original intention was to use his spare time to retrieve the rest of the items from the Swastika Force Treasure that he hadn't managed to take last time.
At that time, his spatial realm was limited, so he didn't take some of the oil paintings he didn't recognize, only taking a part of them, and he took more precious metals.
By now, Sean Knight had already tasted the sweetness—those oil paintings, each worth hundreds of thousands, even over a hundred million US dollars!
Although they couldn't be sold all at once, keeping them in his own spatial realm meant they could essentially be turned into cash at any time!