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Two Marketplace.tf sales: https://marketplace.tf/items/tf2/30135;5;u15
(https://backpack.tf/item/5341364582) June 30 2020: $31.99 (key=$2.01, 15.92 keys) ~16 keys
(https://backpack.tf/item/4588649809) August 20 2020: $34.99 (key=$1.79, 19.55 keys) ~20 keys
Going with 16-20 keys
https://backpack.tf/profiles/76561198104512843#!/compare/1597104000/1597190400
probably sold for 15 pure here, and then the buyer put on mp sale and sold for the ~20 mp sale. Can't say for sure so this should be fine.