How to verify authenticity of an Apple Charger using its serial number?

If you purchase this power adapter directly from Apple or an Apple Authorized Reseller, then it is an original Apple device. If not, then it could be a fake. Apple does not provide a means to verify their power adapters by serial number.

no, the serial number is useless for this it's not some magic number, anyone can get hold of a valid serial number and add it to their faked device

how to check if my iphone adapter fake or… - Apple Community