Hello, and welcome, if you want send custom boxes, you can upload to any place and share here. If you want to make boxes as near as possible to original, you need looking for a original one, and paint over, write over and compare. You can leave in the "drop files zone" and somebody check it, in any time. As you can see the admins of the site are busy, then it will take long time check it and publish it, specially if it not near to original one. I recommend, practice, and if you want share your boxes, you can create an account in Archive . org and share here the link, or any upload files places.
After all, there not many people scan boxes or manuals, so you might as well have fun doing your own boxes.
Regards.