Sale 1:

https://backpack.tf/profiles/76561198269321683#!/compare/1547683200/1547769600

https://backpack.tf/profiles/76561198871495895#!/compare/NaN/1547769600

Scammed?

Sale 2:

https://backpack.tf/profiles/76561198190109028#!/compare/1550275200/1551139200

SCM

Sale 3:

https://backpack.tf/profiles/76561198190109028#!/compare/1551657600/1552089600

https://backpack.tf/profiles/76561198027498435#!/compare/1551657600/1551744000

Untrace

Sale 4:

https://backpack.tf/profiles/76561198319882116#!/compare/1549497600/1549929600

https://backpack.tf/profiles/76561198849471285#!/compare/1549843200/1549929600

Untrace

Sale 5:

https://backpack.tf/profiles/76561198849471285#!/compare/1550016000/1550102400

https://backpack.tf/profiles/76561198127045035#!/compare/1550016000/1550102400

Sold for Showstopper Sorcery + negligible sweets

Sorcery Mini:

https://backpack.tf/suggestion/5c84b4396780721ca6043f88

Suggestion for 5 keys

Sale 6:

https://backpack.tf/item/6822415907

Gambling and tradebacks

Sale 7:

https://backpack.tf/profiles/76561198016176196#!/compare/1548547200/1548633600

https://backpack.tf/profiles/76561198364285816#!/compare/1547251200/1548633600

Untrace

Sale 8:

https://backpack.tf/profiles/76561198208300860#!/compare/1550016000/1550102400

https://backpack.tf/profiles/76561198340634356#!/compare/1549929600/1550102400

Bulk

Sale 9:

https://backpack.tf/profiles/76561198334598690#!/compare/1546905600/1546992000

https://backpack.tf/profiles/76561197987695465#!/compare/1546819200/1547251200

Untrace

Sale 10:

https://backpack.tf/profiles/76561198105098440#!/compare/1547337600/1548806400

https://backpack.tf/profiles/76561198049677507#!/compare/1547769600/1548115200

Bulk

Sale 11:

https://backpack.tf/profiles/76561198300083773#!/compare/1548720000/1548892800

https://backpack.tf/profiles/76561198044684270#!/compare/1548806400/1548892800

QS

Sale 12:

https://backpack.tf/profiles/76561198431725617#!/compare/1547683200/1547856000

https://backpack.tf/profiles/76561198340634356#!/compare/1547683200/1547942400

QS

Sale 13:

https://backpack.tf/profiles/76561198833325235#!/compare/1548028800/1548115200

https://backpack.tf/profiles/76561198223432116#!/compare/1548115200/1548460800

Bulk

Sale 14:

https://backpack.tf/profiles/76561198321443975#!/compare/1548806400/1548892800

https://backpack.tf/profiles/76561198132741569#!/compare/1548720000/1548806400

Bulk?

Sale 15:

https://backpack.tf/profiles/76561198062287671#!/compare/1544572800/1546214400

https://backpack.tf/profiles/76561198062184436#!/compare/1488931200/1549411200

Untrace

Sale 16:

https://backpack.tf/profiles/76561198396253750#!/compare/1548028800/1551484800

https://backpack.tf/profiles/76561197962275479#!/compare/1547942400/1548028800

https://backpack.tf/profiles/76561198335791307#!/compare/1547942400/1548028800

Untrace / bulk

Sale 17:

https://backpack.tf/profiles/76561198335806671#!/compare/1550016000/1550188800

SCM

Sale 18:

https://backpack.tf/profiles/76561198047128640#!/compare/1549670400/1550016000

https://backpack.tf/profiles/76561198142583468#!/compare/1537747200/1550966400

Untrace

Sale 19:

https://backpack.tf/profiles/76561198071640263#!/compare/1542585600/1550361600

SCM

Sale 20:

https://backpack.tf/profiles/76561198093892890#!/compare/1550016000/1550102400

https://backpack.tf/profiles/76561198080179568#!/compare/1550016000/1550102400

QS

Sale 21:

https://backpack.tf/profiles/76561198312670465#!/compare/1550016000/1550102400

https://backpack.tf/profiles/76561198841365001#!/compare/1550016000/1550102400

https://backpack.tf/profiles/76561198012537041#!/compare/1550016000/1550102400

https://backpack.tf/profiles/76561198145072434#!/compare/1550016000/1550102400

https://backpack.tf/profiles/76561198010517907#!/compare/1549929600/1550102400

Untrace

Sale 22:

https://backpack.tf/profiles/76561198010517907#!/compare/1549929600/1550102400

https://backpack.tf/profiles/76561198419584303#!/compare/1549929600/1550102400

Bulk

Sale 23:

https://backpack.tf/profiles/76561198419584303#!/compare/1549929600/1550102400

https://backpack.tf/profiles/76561198155110999#!/compare/1550016000/1550102400

QS

Sale 24 - 27:

https://marketplace.tf/items/1106;5;u3010

$8.33 / $1.75 = 4.76 keys

$8.33 / $1.78 = 4.68 keys

$12.66 / $1.8 = 7.03 keys

$12.79 / $1.8 = 7.11 keys

Total sales @:

4.68 4.76, 5, 7.03, 7.11 keys

Taking 7 flat.