How to include item count from specific location on packing slip?

I have been customizing my packing slip and I would like to add a total item count to the top so we can easily know how many items should be packed in that specific order.

Ideally, I would like it to go based on the location as we have a location for our physical items and a location for digital items. I don’t want the digital items included in this item count since its an automatic process and it confuses our packing people as it makes the numbers look incorrect.

How can I update the code for our packing slips to include the total number of items from our ‘Queen Street’ location?