Working principle of a bone crafted machine Help!!

Hello, as you can see in the picture, there is a Robotic Work Machine and the arm of this machine will be animated to pick up the parcel lying on the ground and drop it further, but I cannot connect the box to the hand of the machine. When I connect it with the bone system, it moves, but when I play the animation from the beginning, the box remains motionless in its old place. I need help with this. I Couldn't Find Enough Detailed Information About Moving Objects Interactively. Thanks in advance