They have to much time on their hands if they are x-raying miners.   Seems like opening a box or two should confirm it. 

I really don't like my local DHL.   It's the service I avoid.    But some claim they work great for them.
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I have used DHL on my S3+, S4, and S5 purchases, all have arrived without any issue. I personally use FedEx for all the other shipping I do. I cannot be upset that customs wanted to check out my package. Regardless, it is now in Miami and out for delivery