MP sales:

https://marketplace.tf/items/tf2/158;5;u58

Feb 21: 15 / 1.76 = 8.5

Feb 23: 15 / 1.77 = 8.5

March 31: 15 / 1.69 = 8.9

April 7: 15 / 1.69 = 8.9 https://backpack.tf/item/2245390949

Bot.tf sales:

https://bot.tf/stats/item?def=158&q=5&ef=Cloud+9&craft=1&aus=0&ks=0

1 @ 8 keys 19/01/2020 https://backpack.tf/profiles/76561198442349647#!/compare/1579388400/1579474800 Keys don't appear

1 @ 9 keys 31/01/2020 https://backpack.tf/profiles/76561198928421771#!/compare/1580425200/1580511600

1 @ 7 keys 26/03/2020 https://backpack.tf/profiles/76561198104034234#!/compare/1585094400/1585180800

Other sales:

1. https://backpack.tf/item/7957141553

https://backpack.tf/profiles/76561198173442901#!/compare/1579392000/1579478400

Unusable

2. https://backpack.tf/item/7957141553

https://backpack.tf/profiles/76561198173442901#!/compare/1579910400/1579996800

Unusable

3. https://backpack.tf/item/7957141553

https://backpack.tf/profiles/76561198381288776#!/compare/1580774400/1580860800

https://backpack.tf/profiles/76561198134546405#!/compare/1580774400/1580860800

Bulk

4. https://backpack.tf/item/7957141553

https://backpack.tf/profiles/76561199013383381#!/compare/1579737600/1580947200

https://backpack.tf/profiles/76561198134546405#!/compare/1580860800/1580947200

???

5. https://backpack.tf/item/7957141553

https://backpack.tf/profiles/76561199013383381#!/compare/1580947200/1581033600

Unusable

6. https://backpack.tf/item/7956863577

https://backpack.tf/profiles/76561198104034234#!/compare/1585440000/1585612800

Unusable

7. https://backpack.tf/item/7956805008

https://backpack.tf/profiles/76561198844734818#!/compare/1580515200/1580601600

Unusable

8. https://backpack.tf/item/7956734787

https://backpack.tf/profiles/76561198199501285#!/compare/1583366400/1584403200

Unusable

9. https://backpack.tf/item/7956734787

https://backpack.tf/profiles/76561198038311292#!/compare/1584489600/1584748800

Sold for 6 keys + 10 ref. Close to buy orders

10. https://backpack.tf/item/7956734787

https://backpack.tf/profiles/76561198158271672#!/compare/1585699200/1585785600

Unusable

Taking 7 - 9 keys