High end is not quite right.

https://backpack.tf/profiles/76561198002757046#!/compare/1505692800/1505779200 - 5 pure added at a minimum

However, the Peace Elfin also moves between these two traders, though the ID#s don't match. Not sure why that is, but there's at least one issue there minimum.

Other sales:

https://backpack.tf/profiles/76561198035884807#!/compare/1511568000/1511740800 - Starstorm Cone (mini at 80, but B/O was 65, caps there)

http://www.tf2outpost.com/trade/29337027

Cone mini: https://backpack.tf/profiles/76561198164651434#!/compare/1510185600/1510358400 - 80 pure, taking 80

https://backpack.tf/profiles/76561198077173426#!/compare/1511827200/1511913600 - Outdated taunt, better used there

https://backpack.tf/profiles/76561198342161127#!/compare/1511913600/1512000000 - Mallard Swagman (mini at 27) and Grail Bad Pipes (mini at 33), 27 + 33 = 60

Swagman mini:

https://backpack.tf/profiles/76561198342161127#!/compare/1512086400/1512172800 - 27 pure, taking 27

Bad Pipes mini:

https://backpack.tf/profiles/76561198195151562#!/compare/1511481600/1511568000 - Planets Exe (micro at 19) + Cyclone Burstchester (micro at 16.5), 19 + 16.5 = 35.5, rounding to 36

+

https://imgur.com/a/uUjTG - Week old seller for 30

Taking 30-36 or 33 for the Pipes.

Exe micro:

https://backpack.tf/profiles/76561198254882979#!/compare/1509148800/1509235200 - 1:1 Max, taking 19

Burstchester micro:

https://backpack.tf/profiles/76561198170071647#!/compare/1510876800/1511049600 - 15 pure

+

https://backpack.tf/profiles/76561198140565712#!/compare/1511913600/1512172800 - Added 1 key for a Max, ~18

Taking 15-18 or 16.5 for the Burstchester.

Sales at 46, 50, 51?, 60, and 65. Lowest seller is 70 based on key B/Os, but multiple aged sellers on MP for just over 60 keys: https://marketplace.tf/items/30003;5;u107 + https://imgur.com/a/fzIuN

I would go with 60 as the high end here. The sale at 65 took a long time and might be high judging by the sellers mentioned above, but 56 is unsupported so 60 will work instead.