Missing Amethyst Shard Chest

After doing the unicorn event, I logged on to try and claim it and noticed I also had an amethyst shard chest to claim at the same time. I claimed both, but I never got the amethyst shard chest. Does it automatically convert to Amethyst Shards or should I be seeing a chest for it to open? I was not looking at my current count of shards so am unsure.