On the stationary shelf ?

Mr cardboard box stuttered and a-spluttered and said he:
“I th think I’m th the nicest hollow square th that you will ever see”

Well Mr Round opened his lid and he did reply:
“Excuse me tis I who is the perfect shape that holds the English tea”

“That can’t be right, that will not do” Mr Oblong he did cry
“Aren’t I the only one who matters here Oh me oh my?”

Then out of the blue a piece of paper
 He stood up and he did yell:
“ You  all are wrong, as I am weighted”
“ It is only I will surely sell”

Well Mr Tanner from the news agents shop
He replys with glee:
“You are equally as important cause without you where would I be?”