Traded in phone paid off early

I purchased a new phone and traded in my boyfriends old phone through the Kiosk at Costco. I had a monthly charge for my phone and my boyfriends phone however, I was reimbursed each month for his phone. I went ahead and paid off both phones early. 

My question is related to my boyfriends phone. There was an approximately $350 balance on his phone and I was getting reimbursed each month for it. Will I be reimbursed the $350 that I paid off early?