Shipping from US to China

Hello i will be sending back my tone board for repair and im wondering about the shipping. I saw on their faq page their instructions for shipping however im confused on a few points. What do they mean by sending back by post? Im assuming it will be sent in a small package correct. Also what do they mean by mark value as $5 and mark as type gift? In you guys experience what did you all do to ship and what was the cost? Thank you.

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