Which psychological principle do companies most commonly exploit when designing elaborate, multi-layer 'unboxing experiences' for premium products?

Packaging is more than just protection for products—it's a powerful marketing tool that influences purchasing decisions and brand perception. In recent years, companies have been investing heavily in creating memorable 'unboxing experiences' that drive social sharing and brand loyalty. This trivia question explores an interesting psychological aspect of modern packaging innovation that many companies are leveraging to enhance customer satisfaction and create emotional connections with their products.

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The IKEA effect (valuing something more when we've put effort into assembling it)
The anticipation reward loop (creating sequential micro-moments of dopamine release)
The scarcity principle (making products seem more valuable through limited accessibility)
The endowment effect (feeling ownership before actually purchasing)