If you know the version of the software you had the last time you installed the jailbreak/hotfix - and you are still on that version - then the jailbreak is still installed.
On paperwhite 5.7+ versions, you will not lose the jailbreak unless you do the reset followed by a software update. ( but reset does remove all the hotfix and SS and other hacks. )
You should be able to re-install the .bin version of the hotfix ( the nomax version from my snapshot thread ), and then continue installing all the other hacks you want to have.
The Key is stored in /etc which you cannot see over USB.
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