Time warp  A Rather Festive Tree (was 90 keys)
https://backpack.tf/stats/Unusual/A%20Rather%20Festive%20Tree/Tradable/Craftable/70

suggested value: 80 keys

Sale 1: Sold with ~32 Keys + A Silver Cyclone Taunt: Soldier's Requiem (3.78) for a GE Tough stuff muffs (115.5 keys) = 80 Keys
https://backpack.tf/profiles/76561198204174904#!/compare/1563321600/1564185600
https://backpack.tf/profiles/76561197993987295#!/compare/1563840000/1563926400
No Buyout

[i]Mini for Jag:[/i]
https://bot.tf/stats/item?def=329&q=14&ef=&craft=1&aus=0&ks=0 - High
https://marketplace.tf/items/tf2/329;14 - Sales at $28 and $30 = 16.5 Keys both times

[i]Mini for Requiem:[/i]
PUT LINK HERE

sale 2:
https://backpack.tf/profiles/76561197993987295#!/compare/1564358400/1564444800
https://backpack.tf/profiles/76561198306288794#!/compare/1564358400/1564444800
Sold for X Keys, used Keys on Stash

Sad spring




Silver Cyclone Taunt: Soldier's Requiem (3.25 - 4.3)
https://backpack.tf/stats/Unusual/Taunt%3A%20Soldier's%20Requiem/Tradable/Craftable/3009

MINI FOR TIME WARP TREE

Taking last 2 Months

Sale 1)
https://backpack.tf/profiles/76561198021947592#!/compare/1548288000/1566086400
https://backpack.tf/profiles/76561198382290208#!/compare/1564790400/1564876800 - Bulky

Sale 2)
https://backpack.tf/profiles/76561198341826777#!/compare/1564704000/1564790400 - Untrace

Sale 3)
https://backpack.tf/profiles/76561198342161127#!/compare/1562803200/1562889600 - Unusualified

Sale 4)
https://backpack.tf/profiles/76561198198740519#!/compare/1562630400/1562716800
https://backpack.tf/profiles/76561198847519855#!/compare/1562025600/1562630400 - Bulky

Sale 5)
https://backpack.tf/profiles/76561198967586727#!/compare/1564963200/1565136000
https://backpack.tf/profiles/76561198960240101#!/compare/1564963200/1566000000 - Untrace

Sale 6)
https://backpack.tf/profiles/76561198454448741#!/compare/1561680000/1564963200 - Untrace

Sale 7)
https://backpack.tf/profiles/76561198031007256#!/compare/1562889600/1562976000
https://backpack.tf/profiles/76561198413362894#!/compare/1562889600/1562976000 - SCM

Sale 8)
https://backpack.tf/profiles/76561198821413037#!/compare/1564099200/1564272000 - Untrace

Sale 9)
https://backpack.tf/profiles/76561198023051867#!/compare/1563494400/1563580800
https://backpack.tf/profiles/76561198821413037#!/compare/1563408000/1563667200 - SCM

Sale 10)
https://backpack.tf/profiles/76561198067679367#!/compare/1564963200/1565049600 - Unusualified

Sale 11)
https://backpack.tf/profiles/76561197993987295#!/compare/1564099200/1564185600
https://backpack.tf/profiles/76561198833479329#!/compare/1563580800/1564617600 - Untrace

Sale 12)
https://backpack.tf/profiles/76561198340634356#!/compare/1565222400/1565308800
https://backpack.tf/profiles/76561198022407862#!/compare/1563580800/1566000000 - Untrace

Sale 13)
https://backpack.tf/profiles/76561198094764602#!/compare/1564790400/1565568000 - SCM

Sale 14)
https://backpack.tf/profiles/76561198290419326#!/compare/1564272000/1564617600 - Unusualifier

Sale 15)
https://backpack.tf/profiles/76561198299393995#!/compare/1563667200/1564012800 - 2 lots of keys match

Mp.tf Sales, cannot find histories

https://marketplace.tf/items/tf2/30673;5;u3009

$7.9 / $1.84 = 4.3 Keys

$4.25 was through buy order

$5.95 / 1.82 = 3.25 Keys

Summary:
3.25 and 4.30