Hello, I am new to amazon seller. I just sent my first box with 30 products. However, when I printed the barcode, Amazon only gave me 28 barcodes out of 30 products. I thought it is because I listed those two products under another person Asin. But today when my products arrived in the warehouse, They said they did not receive that two products. What should i do? Thank you. I am kinda freaking out, and sending email to Amazon never helpful, They always answer something not even relating with my question.