Missing item in Amazon delivery

Tweet

Hubby decided to order card holders for his friend who has a huge collection of sports cards. It was supposed to be a birthday present. Since he doesn't have an Amazon account I ordered it from mine. There were supposed to be 4 boxes of these card holders in the shipment. His friend's wife texted us and said the packing slip said 4 boxes but the shipment only had 3. I went to Amazon and found a way to send a message about the missing item. I thought I would be chatting with someone but it just seemed to send a message to the seller. Then I found a way to actually chat to an Amazon person. I told him what happened and immediately he created a replacement order for that one item. It should arrive by the 14th of October. After I did that I went into my orders to see if this replacement order shows up in my account. That's when I discovered that my original order seems to have two separate deliveries on the same day. One with three items in it and one with one item in it. However, the picture in the delivery email shows only one box left on the porch. Not sure if they actually shipped everything in one box and only put three items instead of four, or if there were two separate shipments, which seems to be the case. Where is the second box then? Hubby's friend's wife said she will look around her property when she gets home from work to see if there is any other box anywhere. She told me there was nothing in the mailbox.