It's not just customs, unfortunately. I once ordered a book of FNAC's bookstore, it was State of Fear as I recall.
I could've sworn someone had dunked the package in water then proceded to make little stratches with a pocket knife.
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Man, I'll be heading to London soon for a nice three day vacation. I use "vacation" loosely because I know I'll either get very tired over visiting the place, sleep very little and arrive back home with a migraine, but that's just how I roll.