亚马逊客户买了18台平板电脑，全部安装了app，现在想要退货？

你要让买家知道，他退回来的产品condition如果和发货时的不一样（发货时是新的、包装未拆开的；退回来是用过的、包装被拆开了），那根据亚马逊的政策，卖家可以向买家收取restocking fee（多达50%）

感觉亚马逊关于电子产品类的退货政策有点模糊，没怎么说清楚：
Computers (laptops & desktops)
• New desktop, laptops or tablets (excluding Kindle E-readers and Fires) purchased from Amazon.com that didn't start when they arrived, arrived in damaged condition, or is still in an unopened box can be returned for a full refund within 30 days of purchase. 
• Amazon.com may test computers that are returned because they didn't start when they arrived and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. 
• Any returned desktop, laptop or tablet that is damaged through customer misuse, is missing parts, or is in unsellable condition due to customer tampering may result in the customer being charged a higher restocking fee based on the condition of the product. 
• New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.
 

他是在购买的30天内要求退货的？是的话，你要接受退货。如果是他反悔不想要了（no longer needed），你可以让他付退回来的运费。我是觉得为了快递能安全送达（毕竟商品价格这么高），你可以要求signature confirmation的服务

楼主，根据亚马逊政策，你可以收取50%的restocking fee：
“Up to 50% of item's price：The buyer changes their mind about a purchase and returns a non-media item within the return window, but the seller receives the item damaged or materially different than how it was originally shipped to the buyer.”
http://www.amazon.com/gp/help/ ... 26140

补充一下，你在收restocking fee前，先跟买家解释一下为什么没有把全部的钱退给他。买家可能会觉得不公平，抱怨你收得太多了，然后去申请AZ。你不用太担心，把事情说清楚就好了，毕竟你是按着亚马逊的政策来处理的

小心一点，这么多台电脑，万一买家退货的时候把哪台给遗漏了，那就不好了。收到货后你才能知道condition到底是怎样的，这时候再通知买家restocking fee怎么收取。要注意，你一定要有自己的退货政策才行

楼主，你应该有把这些电脑的serial number（出厂序号）记录下来吧？这样一来你就知道他退回来的电脑是不是你的了

，亚马逊不同的货物用的是不同的退货流程，甚至还有免退的货物。