The phrase "a box of pastries" is correct and usable in written English.
You can use it when referring to a container that holds various types of pastries, often in contexts related to food, baking, or gifting.
Example: "For the party, I brought a box of pastries filled with cream and fruit."
Alternatives: "a container of pastries" or "a package of pastries."
They even bought me a box of pastries.
Two bottles of water had been outside his cell door, along with a box of pastries, waiting for someone to deliver them.
In-room "picnic-style" breakfasts are generous and equally high-quality: a box of pastries, plus bread, fruit, granola, yogurt and local farmhouse cheeses.
He stopped at a bakery across the street from the church to buy a box of pastries, and his smile quickly spread to the Chinese women in flowery bandanas behind the counter.
You don't need to buy a box of pastries.
5 00am: I make a bank deposit through the after-hours depository and leave a box of pastries at the door for the Oak View National Bank gang -- this small-town bank was a big help getting me started.
They were close to brawling when the Slovenian's wife opened a box of homemade pastries — flaky, buttery mille-feuilles layered with thick whipped cream.
Toward the end of their first scene together, Jascha hands Anika a gift — a box of her favorite pastries.
And he did so during the radio taping, when he spent several minutes extolling the deliciousness of a box of fancy French pastries that a producer had brought him as a gift.
So I moved on with good cheer instead, celebrating my newfound mellowness with a box of canelés (traditional pastries of Bordeaux) at Baillardran.
We bike the Park or along the Hudson, eat in Little Italy making sure to get a box of the best pastries in the City at La Bella Ferrara -- and then drive up 34th Street where we stop the car and let Jordi look straight up to the top of the Empire State Building.
