I'm not a coder but I have a theory. The video of the head disappearing took place while the drop party was in progress. Perhaps there was code in the plugin to auto pickup/remove dropped heads so that if a player had a full inventory, the head would be picked up and then reallocated for the second wave of drops. All I know is that I was lucky enough to receive two bunny heads on .org, but CypriotMerks (or the script) took my second head out of my inventory and then there was a second wave of drops after the initial 50. If my theory is true, all 50 heads are still in the economy (unless somebody deliberately threw it in lava/void).
Now thinking about it, your head disappeared during the iron drops. This is to say that your head disappeared after the second wave of bunny head drops and from what remember, there was no third wave of bunny head drops. Again, this is only a theory on why some drops disappeared. In reality, I have no idea what actually happened so all of this is only speculation.
I dropped my bunny head to my main account and it didn't disappeared. Perhaps they dropped it during the DP which caused the item to disappear *Poof*
This could work for you because you are the person who hosts the /dp command. Try using an alt to host the /DP command and then test it.
If someone wants evidence that they got a bunny head, I've got screens of (almost) every single person who got a head
Do you have a screenshot of my other friend, Leo7Mario (he gave it to me, he acted as a alt kinda) getting a head?
Me too, I took those so that I could ask to buy their heads later. PS: Cyp, get over here, we need a refund.