Finding manufacturer of product based on certifications
This sticker is fake and they are not actually certified.

This is actually quite common these days. I have bought a few power supplies with fake ETL tags, many items from china do. It is expensive to pass ETL and can be thousands to tens of thousands USD.
You check with the ETL, which in this case would be intertek (I am very sure that they keep records of the testing, I've never worked with Intertek but the ETL's I use do). The intertek form is here. The second place is the manufacturer which should also have record.
It has a serial number, so that's a good sign.
Interestingly enough retailers are the ones who are supposed to enforce the ETL marks, they are not to sell products that don't have a correct ETL sticker. Your local fire warden is most likely also interested that everything you own is safe.