Sale 1:

Sold for Miami Nights Gibus (Suggestion at 53) + Bedouin Bandana (4)

http://www.tf2outpost.com/trade/29363006 - B/O of 55

Seller: https://backpack.tf/profiles/76561198078131641#!/compare/1505088000/1505520000

Buyer: https://backpack.tf/profiles/76561198273255771#!/compare/1504915200/1505520000

X = 55 (Capped by B/O)

Sale 2:

Sold for Stormy Storm Well-Rounded Rifleman (53.5)

No outpost

Seller: https://backpack.tf/profiles/76561198068351675#!/compare/1508284800/1509753600

Buyer: https://backpack.tf/profiles/76561198071041124#!/compare/1509580800/1509753600

X = 54

Sale 3:

Sold for Vivid Plasma Human Cannonball (48)

No outpost

Seller: https://backpack.tf/profiles/76561198071041124#!/compare/1509840000/1510358400

Buyer: https://backpack.tf/profiles/76561198039731024#!/compare/1510185600/1510272000

X = 48

Sale 4:

Sold for 40 keys

No outpost

Seller: https://backpack.tf/profiles/76561198313538268#!/compare/1506988800/1507075200

Buyer: https://backpack.tf/profiles/76561198018823628#!/compare/1506902400/1507075200

One key shows up on the seller’s end, the other 39 went towards the beams nappers. These keys can be found here:

https://backpack.tf/profiles/76561198018823628#!/compare/1506902400/1507075200 (under the 50 keys obtained together)

X = 40

Sale 5:

Bulk for Green Energy Tower

Seller: https://backpack.tf/profiles/76561198271935163#!/compare/1504656000/1504828800

Buyer: https://backpack.tf/profiles/76561198078131641#!/compare/1504310400/1504915200

Sale 6:

Bulk for Death at Dusk Hot Doggerson

Seller: https://backpack.tf/profiles/76561198273255771#!/compare/1507420800/1507680000

Buyer: https://backpack.tf/profiles/76561198074924284#!/compare/1507593600/1507680000

Sale 7:

Bulk for Phantasm Yeti

Seller: https://backpack.tf/profiles/76561198074924284#!/compare/1510099200/1510185600

Buyer: https://backpack.tf/profiles/76561198123146104#!/compare/1510099200/1510185600

Sale 8:

Bulk for Bonzo Trash

Seller: https://backpack.tf/profiles/76561198123146104#!/compare/1510272000/1510358400

Buyer: https://backpack.tf/profiles/76561198104951367#!/compare/1510272000/1510358400

Miami Nights Gibus:

https://backpack.tf/suggestion/5a09b9b544325a04c4620e6d

Sellers:

50 keys:

https://i.imgur.com/I8nF1UM.png - 2 days

55 keys:

https://i.imgur.com/3n8Is3i.png - 1 month, duped

Sales at:

40

48

54

55

Going with 40-55.