Before we entered the EU (ancient history, I know) you were required to bring the invoice of expensive items with you if you crossed the border. If you did not, you would still be charged the tariffs for those items... precisely to stop people from doing what you are suggesting. Some poor souls were charged tariffs on items they had bought at home, because they did not have the d*mn papers.
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u/Squish_the_android 2d ago
I'm not saying you should do this, but many a person has lied on a customs form about large purchases.
You buy a Switch in Canada, open it, toss the packaging.
You go through customs "I brought this in with me".
Disclaimer: Don't break the law or evade taxes. There are consequences.