Overwatch – Are Loot Box Qualities Based on RNG?

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For my first 9 level ups I did not get any Loot Box quality higher than the common grade, the boxes with a white glow.

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At level 10, I got my first "better than common" grade Loot Box, this time with a blue glow.

Some I have seen from others are boxes that come with purple and orange glows.

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https://media.giphy.com/media/3o6gb7X6NwaUBI8EXS/giphy.gif

I am wondering, are the quality of Loot Boxes predetermined? Am I only set to get the rarer loot boxes when I hit bigger level milestones, such as every 10 or every 20 levels, etc.? Or is the type of Loot Box received completely random and am I just unlucky I guess? In the common box, I actually unboxed a legendary skin, seen below, so glows only guarantee you'll get at least a rarity of whatever the glow is. Contents below:

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Best Answer

According to wiki,

Each Loot Box contains four random items that can be used to customize the appearance of heroes. Items come in common, rare, epic, and legendary quality levels, and every Loot Box includes at least one rare quality or better item.

and,

even unopened Loot Boxes will glow in a color corresponding to what items are inside.

so if you haven't gotten a box before with a different glow, you just were unlucky that you hadn't gotten as rare of items in your previous loot boxes.