How to know if bootloader unlocked officially or not? And then some. (Snapdragon)

What it says in the title. I got the phone from a guy, who I assume got it from aliexpress (because it had gifts with it) or imported some other way. The phone came in fully packed up, in all kinds of stickers and protective thingies and in it's box, with all the equipment packaged. Even has the protective thing (can't remember the eng word) over the screen still, so I'm pretty sure the phone is new and not used.

Anyway, if I'm not wrong the bootloader shows its already unlocked. Now my first goal is to root it, and I saw a lot of guides, and decided to follow these here but theres separate guides for officially unlocked and unofficially. My phone came like this so I don't know which is it.



So questions:
1. How can I know whether its officially unlocked or unofficially?
2. Did I decide to follow the right guide or is there better ones?
3. My MTP and other drivers isn't working. I have Windows 7 Ultimate. EDIT: After installing a bunch of drivers I found, including the PCSuite, universal adb drivers, and what not, MTP appears to be working, I can access the phone just fine and theres no exclamation mark over it like in "Devices and Printers". But I have some exclamation marks in device manager, as seen on screenshot. I'm not sure if "Unknown Device" is related. It could have been there before the phone, but ADB is new.
4. Are these exclamation marks an issue for following the guides to root and flash? The fastboot commands from screenshots work fine.

Phone Info:
- Android Version 5.1.1
- MIUI Version MIUI Global 7.3 | Stable

Sorry for the long post. :P

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