Previous suggestion still in-date, credit to Deller for the first sale:

https://backpack.tf/suggestion/6852878c41647d8d4a008ca4

https://backpack.tf/item/8633693501

https://backpack.tf/profiles/76561199745887780#!/compare/1748649600/1748822400

https://backpack.tf/profiles/76561198161980756#!/compare/1748736000/1748822400

140 pure

Newer sales:

#1

https://backpack.tf/profiles/76561198161980756#!/compare/1750291200/1750464000

https://backpack.tf/profiles/76561198396499936#!/compare/1750291200/1750464000

https://backpack.tf/item/8633693501

Bulk for Nebula Universal Translator

#2

https://backpack.tf/profiles/76561198396499936#!/compare/1751760000/1751846400

https://backpack.tf/profiles/76561198041850120#!/compare/1751587200/1751846400

https://backpack.tf/item/8633693501

Sold for 180 keys (Buyer’s end)

Instead of manually counting the keys on their end, I worked out what the other two items sold for and assumed the remained went towards the Practitioner:

https://backpack.tf/item/10801814071 - Sunbeams Rifleman

https://backpack.tf/profiles/76561198850121720#!/compare/1751673600/1751760000 - Near ID: 15906758561

189 keys match

https://backpack.tf/item/1152114573 - Blizzardy Storm Luchador

https://backpack.tf/profiles/76561198062747535#!/compare/1751760000/1751846400 - Near ID: 15907309740

180 keys match

549 keys leave the buyer’s inventory

549 - 180 - 189 = 180

This lines up perfectly with their B/O!

https://i.imgur.com/bEBtYAS.png

Should be pretty clear that it sold for 180 keys.

No current sellers.

Sales at:

140

180

Taking 140-180 keys.