What if they're counterfeit OnePlus products and somehow the message to be released to the public was lost in a 'telephone' game? Brand name dilution can cause some less tech-astute folks to refer to earbuds by the popular AirPods brand name. And given the visual similarity it's easy to see how this kinda thing could cascade from a miscommunication like that.
That said it's also pretty believable that CBP thought they were intercepting clearly marked OnePlus goods as infringing on Apple's trademarks....somehow...
If you're the organization in charge of protecting against counterfeit claims, you better be able to tell the good, the bad, the fake apart. I don't think I'm setting too high of a standard. Also, when making a press release about your "success", it would be a good idea to take a breath and actually look into the seized goods. In this type of situation, waiting 1, 3, 5 or even 7 days until everything was clear would have zero negative effect.
That said it's also pretty believable that CBP thought they were intercepting clearly marked OnePlus goods as infringing on Apple's trademarks....somehow...