I lifted the square envelope and looked at it.

When Ryan opened the spiral, a square white envelope fell to the floor.

From the safe he took a square blue envelope.

I'm after a square blue envelope in your safe.

Her eyes fell on a square white envelope lying on the rug just inside the closed door.

There was also a square envelope with my name written on it in her familiar hand.

There was a square white envelope tucked under the ribbon.

He holds the square envelope out in front of him as though it were about to explode.

A square envelope, belonging, in fact, to the ship's stationery.

"This came for you," Catherine said, handing him a square envelope.