I believe we all know about the bug yesterday which allowed people to buy Blood Moon capsules for 1 BE each. It lasted for 14 minutes, but thousands of people were able to take advantage of it.
What Riot did was removing the Aatrox skin and the points obtained. Due to the complexity of the process they won't be removing the capsules themselves, letting many of those people get away with it.
What I say is just wipe out their entire loot inventory ± mastery tokens, in addition to taking away the skin and points. This will erase some (or many) legitimate purchases, but once you've crossed the line I don't think you are in position to ask for fair treatment.