You sounds nuts! 2 laptops and iPads? and then a desktop on top of it?! How long are you planning to stay here? I would leave the desktop at home, even the iPads are a bit too much, but if you can't live w/o them, bring'em
If at customs you show them your laptops and their receipts that's all you need, they won't search your luggage, ever, unless you say you have nothing.
MS I/II [x]
Step 1 [x]
MS III/IV [x]/[]
Step 2 CS/CK - [x] / [x]
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