Game Mechanics: Soulbound Keys Disappearing

[Ssouky]

Hello,

I was invited into an HS group yesterday. It was the 2nd or 3rd time I would be going to HS so I definitly had a key.
As I was going to enter, I couldn't find my key in my bags. I had my Trak idol but no more HS key.

This is for the facts. I don't know much more.

For the assumptions, i've been reading here that HS key might disapear after dying in PoS : I was in sky last saturday and corpsed. It could be linked.

Thanks for looking into it and taking the time to solve this.
Cheers !

Character : Ssouky
Server : Blue
Bound : Cabilis