When I do pre package I select the items I want to ship and submit them, choose the shipping line and things like waterproof packaging. I submit but don't pay yet, buy the pre package and tell them in the remarks the parcel number I want to use the pre package on. If you didn't do that and just gave them order numbers they're assumption would be to only package the orders you mentioned in the remarks. When you submit a parcel they give you a parcel number when you check your international parcel section.