In EU and countries implementing EU SOGA it's a little more complicated.
1) Your contract is with the retailer. The retailer is responsible for warranty for 1 to 6 years depending on product.
2) Any maker's warranty is in addition to rights under (1).
The "warranty is void if this sticker is damaged" may indeed be invalid or only apply to (2).
In general only a qualified person (for the product repair) should open a product, but many items can easily be opened without any damage.
I've seen one radio with a clock where the clock battery is separate and only accessible by taking out all the screws on rear of case and opening it. Then the button cell can easily be replaced.
Many laptops have a separate CMOS/Clock battery that wears out and only accessible by disassembly of the laptop. Dell and Lenovo often supply free service manuals that show how to do this.
In the early 1980s we repaired PSUs for Apple retailers, as generally any warranty only applies to a customer. Our repair charge was cheaper than the shipping to Apple, who would charge the retailer for a PSU, no warranty to retailer. Apple got fined more recently for selling "warranties" to customers. If Apple or any other maker sell direct, the local version of SOGA applies. Even today a retailer may get no replacement. The EU is looking at forcing makers to give a similar SOGA rights to wholesale/retail.
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