The items are more likely being seized as counterfiets. In the USA, taxes are generally not due if the value of the shipment is under $2,000. You can view more information about this at cbp.gov - the US Customs website.
I'm not saying that Gamefreak is wrong, but I have NEVER heard of customs holding counterfeits for taxes due since they are illegal in the first place.
I certainly wish you the best of luck, it cannot be easy being disabled, especially in today's political climate.
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