Head interior and communicate with Gred and either play a recreation of Gwent and win to get the papers, or use Axii stage one to steer him. https://qnnit.com You can also call for the papers and start a fist combat, however there is no need for that. With the papers in-hand, head again to talk with Muggs. You can ask for extra money but you might not get it. After the communication the hunt concludes.