Re: Android System battery drain in Note 5 when stand by (Not fixed so far)
Well in the US you are going to be limited with help from Samsung USA on an international phone.
I'm not sure about Best Buy.. It might depend on who you get at Best Buy and they are likely to have to download the software of they will do it.
There are others with this version in the US that aren't having the drain like that. Also people outside the US with that version and not having those issues.
You can also download Samsung firmware from sammobile.com. The free download is slow, but you can download it and flash yourself. Best Buy would be the easier option of they will do it.
Personally, I only buy US variants because of the options available if there is a problem.
It won't hurt to go to Best Buy and ask if they can reflash it.