[Patched as of 0.0.6 update] Yep, all you have to do is pack and steal items that aren't essential to that room. Then you sell the items at the pawn shop BEFORE YOU COMPLETE THE MISSION, SELLING THE ITEMS AFTER COMPLETING THE MISSION WILL DEDUCT PAYMENT, EXP, AND FAME. The reason why you sell before you complete the mission/contract is because the game deletes all record of that item and what it is connected to when you sell it. Make sure you only steal items that the room can function without like stealing books and decor from shelves, stealing TVs from living room [NO STEALING TV FROM TV ROOM, YOU WILL REGRET IT], stealing Fridge and Ovens from kitchen, etc. If you pack and sell items like radiators, beds from bedrooms, toilets from bathrooms, etc. The game will deduct not for stealing, but for that room being incomplete.

Welp, if you are lookin for some money, use this method to gain extra money. Try it asap because devs might patch this glitch in upcoming updates.