(e.g., direct from Dyson, a retailer like Sephora, or a third-party seller), and I can provide more tailored advice.

: The original box usually has the serial number printed on a barcode label on one of its sides. In the Documentation : Check the front cover or the back of your Operating Manual Dyson India How to Verify Authenticity Online

I will execute these searches now. search results have provided some initial information. Result 0 from the first search seems to be from dyson.co.uk and indicates that the serial number is on the rating plate located on the cable label towards the plug. Result 1 is a manual page, and result 2 is a manual. Result 3 is a wikiHow article about spotting fakes, which might contain information about serial numbers. The second search result (Dyson serial number check warranty register) shows a result from media.dyson.com which might be a PDF, and other results from dyson.com and support pages. The third search result (verify authenticity) includes a Reddit post and a Dyson page about counterfeit devices. The fourth search result (serial number format) includes a support page with an example format. The fifth search result (check serial number online) seems to be mostly support pages in various languages. The sixth search result (support serial number not found error) includes a page with an error message. The seventh search result (general how-to) shows a manual page.

A4: If the sticker is damaged, you may still be able to find the number in the original product manual where you might have noted it down. If not, your final option is to contact Dyson Support directly. They may be able to use other information about the device to identify it.