Unavailable Skins in PBE - question.

Okay this isn't a really important question or discussion in any case, but I have a question related to skins in PBE store that were ''removed'' aka that are made unavailabe (Guardian Pajama Lux, Death Sworn Katarina and many more). Does someone know if those skins who are not available in the Store can be obtained through Hextech unboxing? I know that some can't be obtained like PAX Sivir, Neon PAX Sivir etc., but can these other skins who are available on Live Servers be obtained? As I saw Zombie Brand wasn't available in the store for purchase, but I got that skin from Loot. I want to know because I honestly want to test and see some skins if they are worth buying on Live Servers.
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