An item worth about 30m at the time disappeared from my friends gallery in 09 and 'tnt had no record of them ever having the item' either. They never went inactive though.
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Also could it be that high value items are being long term trade reversed like how ucs sometimes are? ik the common belief is that items transactions aren't tracked for more than a year or two, but this leaves me curious, especially when tnt in the past has stated they can't check which users all have a specific item.