About your luck

Hi everyone, after a really long break (2012->2025) I came back and finish to up my boy. After that i opened something in my inventory which gave me the full set of batman deathmetal (each one gold), is it luck or is it normal ? If it's luck, what about yours ? What did you found or opened or even bought on the brooker (for so low price that it's insane) and was the thing you look for so long or just like me it dropped on you for no reason but it was really appréciable?