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I don't think this is really traceable, especially without an available listing snapshot:
https://backpack.tf/profiles/76561198188093413#!/compare/1625011200/1625097600
https://backpack.tf/profiles/76561198038666068#!/compare/1625011200/1625097600
60 keys:
https://backpack.tf/profiles/76561198038666068#!/compare/1627603200/1627862400
https://backpack.tf/profiles/76561199060056598#!/compare/1627776000/1628035200
The untraceable sale was for 49 Keys:
https://backpack.tf/item/9195098863 Histories might not match, but IDs do.
This should be 49-60 Keys, resuggest at that.