A large cardboard box (Fallowfield M14)

This is for a friend, who was given an under desk running machine. but it's damaging her knees. She can return before the 22nd, but no longer has the box. Any help with a box gratefully received. Thank you. It's a bit cumbersome as she is too anxious to put her own details her, so I will pass on details when I have time to monitor this. Thank you