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For the suspicious items, you have to apply to sell and wait for 3 days' verification before you can trade them to other players. Complicated? But if that player is your trade partner, things will be different.

Trade partners can trade items to each other as they want, which means all of their items will not be marked as suspicious .

Open your Address List, then click the Trade button and the player you want to be your trade partner.

You can also click the Trade Partner button while trading to invite that player to be your trade partner.

After establishing the trade partners relationship, you need to wait for 3 days' verification. After that, you will be formal trade partners. You can have 10 trade partners at most.