P.E.T Bonus Boxes Multiplicator

Hey,
i am Tim and i want to know how u could get x3 or x4 Extra Energies with 1 Bonus Boxe. I thought that it has something todo with the P.E.T ... Or is that wrong ?

Thank you for travelling with "Deutsche Bahn" :-D

with my pet i collect 3 energies, but i reset my skilltree and put points to collect, and bought 5 protocol savage.