The Jumping Balls

Sorry! Unfortunately, that was the wrong answer. Why don't you check the video again!?

Correct is this:
The package jumps clearly higher than its original height. How can that be?

The much bigger sitting ball reaches the ground before the package. This means that the sitting ball also bounces off before the package. In this moment, however, the package is still falling and because of this it hits the sitting ball which is already moving upwards. During the collision the sitting ball passes a great part of its momentum onto the package. Due to that the momentum and velocity of the package are reversed. The package is catapulted up into the air with high velocity. This means that the package keeps a great deal of its kinetic energy and that it receives additional energy from the sitting ball. This means that during the moment right after the collision the package's kinetic energy is higher than before. After a while this kinetic energy is transformed into potential energy because the distance to the ground increases and so the package's velocity decreases. This continues until the package's velocity is zero. This is the exact moment when package reaches its highest point in the air. Right after that, it turns around and falls downwards. Because energy is passed from the sitting ball unto the package, it jumps much higher than its original height.
The sum of energy before and after the collision, though, is still the same. No energy can get lost. And the same goes for the total momentum - it is still the same.