Warranty Void Stickers are also known as Tamper stickers. The purpose of a tamper sticker is to leave evidence if a product has been opened or tampered with, thus removing the warranty. Hence why it is called tamper stickers or warranty void stickers.
The most common place to find Warranty void stickers are on appliances or on computer boxes. Tamper stickers are usually small but printed in large quantities for products that are being mass produced. Core Digital Printers can print full colour tamper stickers.