The nekos look pretty much the same in all the stockings/socks. Either their paws are sticking out or not.

socks stockings neko atsume

They look the same in all the pails/pots.

pots pails neko atsume

aluminium pot

The normal cats sleep in the earthenware pot, aluminium bowl, aluminium pot and fruit basket in the same way.

basket earthenware pot neko atsumealuminium pot

You should get:

Special items: earthenware pot (Nabeneko San / Chairman Meow)

1 sock, 1 pail