I'm not sure it has 300 sheets. It looks to be part of a bigger package of paper. It is sealed and unused. Disregard the 300 sheets label.
The Kirkland Signature 4 x 6 Professional Glossy Inkjet Photo Paper is a high-quality printer photo paper suitable for all Inkjet printers. With a sleek white color and glossy finish, this paper produces vibrant and professionally-looking photos. Manufactured by Kirkland, a trusted brand known for their reliable products, this paper is perfect for printing photos in the 4 x 6 inch size. Made in the United States, this paper is designed for optimal print quality and is compatible with any Inkjet printer model.