I would ship it out. It just doesn't seem like you have anything to worry about because since you are not advertising the adapter to have Qualcomm parts in it, if in some way you are infringing on a patent of theirs, then you have plausible deniability. It would be too much reaching on their part to take any action against you. I doubt as if they would be using one of their main corporate addresses to bust sellers. Usually that is outsourced to another company, a law firm, or some clandestine department that would not be located at corporate.
Also there are many reasons that they might want to purchase you item that don't involve any negativity towards you. In all the case I can think of, a competitor or vendor would not be too thrilled to hand over the item to them.
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