I don't think you can direct Amazon to not use USPS for deliveries, especially if the item is being delivered by a third party vender. They do it as a cost saving measure. And, I don't think you can direct USPS to do anything that they don't want to do. The best thing you can do is to try to order items with a short delivery time, so USPS cannot meet the short delivery schedule. Almost everything I order from Amazon has a 1 or 2 day delivery, so they rarely use USPS.
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