The same is happening to me I grabbed one and took it overseas and then spent a large chunk of my families holiday dragging them around to find caches with trackables listed so that I could take one back home across the ditch and didn't find one.
Thought it was an Ozzie thing and then since then I have had even worse luck in NZ. Seems its an unfortunate and frustrating problem. Sad for those who have sent them out on the adventures in the first place.