I had 2 key fragments and 90 tokens. I decided to buy a full key and a keyfragment so I can have 2 keys for my 2 boxes. Somehow my 2 existing key fragments disappeared after I opened the first box and only 1 key fragment remained on my inventory. Now, I dont care all that much personally but this is probably replicable so I thought I would bring it up here since it might affect other players. Be careful when crafting keyfragments and opening chests cause they might disappear into the void, try doing it one by one.