Games : When is an item removed from its Item Pool?

I want to do a Jera + Blank Card break.

I've found the Blank Card in a Basement shop but I hadn't enough coins to buy it, so I had to leave it there.

Anyway I've started generating several chests with D20 + Sharp Plug and I've already exhausted the Golden Chest item pool, I'm finally getting Tresure Room items.

So I'm wondering: can I still find the Blank Card if I've already seen it (and not bought) in a shop?