In the old system, if it triggered it said "Feelin' lucky" but if it didn't re-roll a better one and it gave you the original roll, it didn't say anything else. So that's how you might have gotten a grey. But if it did get a better item (determined by color) it said "You are lucky!" and you get the better one, so that's how you sometimes would get a white item and they'd say you are lucky.
At least that's how it was in PL.
In the new, apparently, if you roll a grey it re-rolls a white, white goes orange, orange goes green, etc... totally different.
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