Nike could soon find itself in legal trouble with the United States Postal Service (USPS) due to one of its upcoming Air Force 1 styles resembling the agency’s shipping boxes.

The shoe that caught the attention of the postal service was the forthcoming Air Force 1 Experimental pictured here. It features design cues obviously borrowed from USPS’s various Priority Mail boxes, including the signature red, white, and blue color scheme and a shipping label attached to the heel. However, there aren’t any official logos from the postal service on the shoe.

This week, the postal service issued a statement saying that it does not receive any tax dollars for its operating expenses and relies on the sale of postage, products and services to fund its day-to-day operations. Additionally, they claim that sales from unauthorized and unlicensed products like this Air Force 1 Experimental deny support to the hardworking women and men in the company. The postal service also challenged the sportswear brand’s position in protecting its intellectual property, as Nike recently filed its own suit against Brooklyn-based collective MSCHF over the release of a custom Satan-themed Air Max 97 in collaboration with rapper Lil Nas X.

“This is an unfortunate situation where a large brand such as Nike, which aggressively protects its own intellectual property, has chosen to leverage another brand for its own gain,” USPS said in a statement. “The Postal Service is disappointed in Nike’s lack of response to repeated attempts to come to a solution. The Postal Service will take whatever actions it deems necessary to protect its valuable IP rights.”

At the time of publication, Nike has not made a statement regarding its upcoming Air Force 1 Experimental release. To read USPS’s full statement about the shoe, click here.