It looks like you may be offline. Without further information it is difficult for me to provide the best advice but I will certainly try. Please reply when you can and we can continue the conversation.
When a pup acts like this around open packets it is generally because they have formed an associated between the packet and them.
If this sound sometimes means food is coming, they will ask for food every time.
Pups are so food driven that they will act this way even if it happens rarely.
It is important NO ONE in the home shares food in this manner or feeds the pup from the packet. Consistency is key.
When serving meals or treats, never open the package within earshot of the pup, so they don't make the association.
It can take weeks (or sometimes months) for it to 'click' with the puppy and for them to understand the noise does not mean they get a treat. The association will eventually break and the packaging will no longer excite them.
When he does beg or cry, it is best to ignore or re-direct to something else (you can ask a training command or start playing with a new toy).