This is a very easy to see slip up.

In the episode restaurant row go to the scene where arthur is on the phone with PBS.

He mentions to Carrie that he wanted a tote bag but instead they sent him something else,you can clearly see the box it's big and it says civil war on it. Heres the slip up

if you pay close attention to the box it completely changes right before your eyes.

It becomes a total different smaller box.

and it also says something on it like the great war or wall im not sure but its defiantly a different box.