The user you reported has been banned, thank you for your report.
Trading with scammers.
Fashionist (Banned and marked DO NOT TRADE https://backpack.tf/u/76561198083611023 ) depositing KE into Bitskins bot:
https://backpack.tf/profiles/76561198261121196?time=1549677041 [does not appear in other inventory at any point, however name does show up in history]
No apparent compare link between Fashionist and Kafka, or the Bitskins bot and Kafka. Inventory likely made private temporarily in the exchange.
Hellfire KE appearing in Kafka's inventory:
Kafka depositing the KE into Marketplace bot (where the hat currently is located):