In a recent Desert Arms mission updates, several bugged item trade-ins were added. The items obtained through these trade-ins had fixed percentages and elements. These bugged trade-ins were fixed during July 9th's maintenance period. Players will now receive random attributes on these trade-ins.
Update: People that were affected by the trade-in bug will have the option to sell the item and receive the original materials in their common box in a future update.
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