Guild Wars 2

I had a Sample Detector and was going around looking for the green nasty stuff, then it suddenly disappeared when I was at the Karka Hive. I though “oh there must be a timer”, so I went back to get another.
When I talk to the NPC “Can I get another of your sample detectors?” the dialogue closes and nothing happens.

Is this a bug?
How can I get another sample detector if I lost my first one?

Look for the item in your bags.

once you get it the first time, the item goes into your bags.

Oohhh found it, I thought it was my candy thing… thank you very much!

Danicco.3568:

Oohhh found it, I thought it was my candy thing… thank you very much!

Ain’t no thang, did it myself as well. ^^

Edit: Wait, what candy thing? There’s a candy thing? I like candy!

WyldKat.4712:

Edit: Wait, what candy thing? There’s a candy thing? I like candy!

It was from some past event, Halloween I think?
That’s the same image from the Candy Detector…