I have several empty NIKE boxes in youth sizes: 5, 6 and 7.
Delamu Large Sturdy Shoe Organizer, 6 Pack Plastic Shoe Storage Boxes with Magnetic Door, Clear Shoe Boxes Stackable for Closet, Shoe Containers for Sneaker Storage, Display Shoe Case for US Size
Shoe Organizer with Hard & Thick Plastic Board Shoe Storage Boxes Fits US Size 13, shoe boxes Clear Plastic Stackable Measure L14.2xW11.2xH8.5(inch) For Sneaker High Heel Storage & Display (YB-12PK)
Nike By You White Empty Replacement Shoe Box & Tissue Men's Size 6 Women's 7.5
Amllas 8 Pack Shoe Boxes Clear Plastic Stackable, Large Shoe Storage Organizer with Lids,Drop Side Shoe Containers for Entryway,Sneaker Storage Fit up to US Size 13 for Men/Women(13''x 10.6”x 8.3”)
Nike Empty Shoe Box Size 6 Youth Orange Nike Shoebox Replacement Box
INSTY Shoe Boxes,Set of 12, Shoe Storage Boxes Clear Plastic Stackable For Closet, Sneaker Storage, Shoe Organizer with Magnetic Door, Fit up to US Size 12 for Men/Women(13.4”x 9.8”x 7.1”)
Custom, Trendy Wholesale Nike Shoes Box for Packing and Gifts
STAHMFOVER Clear Shoe Box Stackable Plastic Sneaker Box Container, Magnetic Side Open Shoe Organizer and Shoes Storage Case, Full Transparent Versatile Display Case for Hats/Models : Home & Kitchen
Drop Front Sneaker Display Cases - Clear