3 sales

1) With 1 key + 30 ref + Disco Beat Down Sky High Fly Guy (17) + Spec Australium Scattergun (27) + Killstreak C.A.P.P.E.R (2) for Circling TF Logo Salty Dog (61)

https://backpack.tf/profiles/76561198154062277#!/compare/1549756800/1549929600

https://backpack.tf/profiles/76561198405223769#!/compare/1549584000/1549756800

C.A.P.P.E.R is selling for 2.3 keys

https://backpack.tf/stats/Unique/Killstreak%20C.A.P.P.E.R/Tradable/Craftable

Ausie scattergun is selling for 27 keys

https://backpack.tf/stats/Strange/Australium%20Specialized%20Killstreak%20Scattergun/Tradable/Craftable

DBD Sky Guy sold for $27.99 on 13th of December, keys were $1.64

https://marketplace.tf/items/30984;5;u62

27.99/1.64 =~ 17 keys

No mini for salty dog, using current value

https://backpack.tf/stats/Unusual/Salty%20Dog/Tradable/Craftable/11

61 - 2 - 2 - 27 - 17 = 13

--------------------------------------------------------------------------------------------------------------------------------------------------------------------------

2) https://marketplace.tf/items/30753;5;u34

2.1) $28.5 on 8th of January, keys were $1.75

28.5/1.75 =~ 16 keys

2.2) $28.49 on 28th of December, keys were $1.79

28.49/1.79 =~ 16 keys

--------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Total: 13, 16, 16

Excluding 13 and going with 16 only.

If you will found other sales - you're welcome to report them.