It's important to bring your receipts, so you can argue if there is a charge. Last time I brought a giant
TV box with me, there is no way to hide. The custom guy looked at the receipt and only charged me the
part that is above $300 (3 years ago) and I paid it with my credit card, easy. I did not speak a word with him.
The TV box is so frking big, the entire custom people were waiting for me as I was approaching the X-ray machine.
After I paid the tax, it's still much cheaper, about $1000 dollars less than the store on Santa Fe. I did pay a small amount
for the extra large box to the United.
Update. I flew in to Rosario. They searched my bags. Saw the PS4, asked me if it was a PS4, I said yes, and they just continued searching, uninterested.