2 items same tracking number in 1 package

Hi, so 1 person purchased 2 items. As they were going to the same address, I put both items in the 1 package. 

Tracking shows only 1 has been delivered and my funds will be available in a couple of days, but the other says that its waiting for delivery - funds on hold. 

How can I ensure that I receive funds for both items ive sent and have been delivered?