iPhone charger adapter serial number check

Won't do you any good as Apple does not provide a means to verify the power adapter's authenticity via a serial number, as these can be faked.

The bottom line? If you purchased this "Apple" power adapter directly from Apple or an Apple Authorized Reseller, then it would be an original Apple product; otherwise, it could be a fake.

If you would have done a search on this forum, you would have found that out already.