It is ALWAYS good practice to remove the tubes from their sockets and return them to their boxes. You can then wrap all this in bubble wrap and then put this bundle back inside the amp IF it is secure. If all judgement leads to shipping the tubes in a separate box, and the product is too heavy to ship USPS, I would still ship the tubes through USPS and then pray all else survives the shipping with the other carriers. Shipping the product with tubes installed is a disaster waiting to happen.
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