My brand new acer nitro 5 laptop has a serial number sticker above the actual acer sticker and they both have different serial numbers but the one which is above the original one shows in the website support page.
The left speaker also seems a little louder than the right one although it is not so noticeable and the fan also make a clicking or ticking noise just for 2-3 seconds while starting up.
The retailer I bought this laptop from isn't the authorised distributor of acer and he gave me one year local warranty, I went to his store just a day after i bought this laptop he inspected it and said that there is no problem and told me that left speakers are louder than the right in every laptops even tho i knew this was not true.
My Serial Number is: UNQH4SG001XXX
[Edited the content to hide sensitive information]