*UPDATED VERSION*

Sale 1:

Buyer: https://backpack.tf/profiles/76561198263070126#!/compare/1538870400/1539475200

Seller: https://backpack.tf/profiles/76561198121830870#!/compare/1538784000/1538870400

^

= 17 keys + 34 refined + T.O.D ticket (15.33 refined metal at the time of sale) + name tag (9.33 refined metal a the time of sale)

= 17 keys + 58.66 refined metal (1 key and 24.11 refined metal at the time of sale)

= 18 keys + 24.11 refined metal (keys at the time = 34.55 refined metal)

≈ 19 keys

Evidence of key value:

https://backpack.tf/suggestion/5b8bf52a44325a5e90156343

https://backpack.tf/suggestion/5b961e5f44325a514162d980

Evidence of T.O.D Ticket:

https://backpack.tf/suggestion/5b3fb5a7cf6c751eb64c445c

https://backpack.tf/suggestion/5b9089d744325a0d2f18cc97

Evidence of Name Tag value:

https://backpack.tf/suggestion/5b78338b44325a5b932c1ab4

https://backpack.tf/suggestion/5b98606c44325a3e717e994c

Sale 2: (credits to Blaze.xTH3RM4Lx)

https://backpack.tf/profiles/76561198136702159#!/compare/1535760000/1535846400 - 17 key sale seems to be valid so that should be included in the range here

texas: https://backpack.tf/item/1670310621

keys:

https://backpack.tf/item/6485212673

https://backpack.tf/item/6736713043

etc

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Further evidence, guidance and help are always welcomed!