Hello, so today I bought my sigelei 150w box mod from a local vape shop. Everything about my mod seems legit and it hits like a beast. The only thing I'm worried about is that it did not come with a COA. The packaging came in a black box with the box mod, warranty card, user manual, and the sigelei market survey card but did not come with a certificate of authenticity. I asked the worker at the shop if it was authentic and he assured me it was. I also checked the chip by holding down the fire button and popping in one of the batteries and it is indeed a YH SX 300 V7.4 chip. I'm still skeptical if its a clone and if i've been ripped off. So my question to you is, did yours come with a COA? Does it have to come with a COA? And if it didn't, how can you still prove that its authentic? idk maybe they just forgot to put in the card in my particular package lol