Why are these sales so hard to trace?

Sold for a Dead Presidents Bot Dogger(9 Keys with Overpay)

http://www.tf2outpost.com/item/440,3670275005,30013,5 Gridiron History

http://www.tf2outpost.com/item/440,3678140364,30018,5 Bot Dogger History

Sold for an Aces High Wet Works(9 Keys with Overpay, 10 Without. Depends on how you see it fit)

http://backpack.tf/item/2125777282 Wet Works History

http://backpack.tf/item/3512332121 Gridiron History

Sold for an Orbiting Planets Big Chief(10 Keys with Overpay)

http://backpack.tf/item/1109114651 Big Chief History

http://backpack.tf/item/3512332121 Gridiron History

Both sales below are credit to Hex

Total = 7 Keys at the time(Outlier)

| Sold for 1 Earbud - 7 [ http://i.imgur.com/h9pMMBt.png ]

| Histories:

- Gridiron Guardian: http://backpack.tf/item/3512332121

- Earbud: http://backpack.tf/item/159627624

22.5 * 0.9 = 20(Outlier)

| Sold for Planets Yellow Belt - 22.5 [ http://i.imgur.com/sP8qkuy.png ]

| Histories:

- Gridiron Guardian: http://backpack.tf/item/1687939884

- Yellow Belt: http://backpack.tf/item/2293157246

Orbiting Planets Big Chief mini suggestion

Sold for a Blizzardy Storm Virtual Reality Headset(11 Keys with Overpay)

http://backpack.tf/profiles/76561198049447942?time=1427353200 -> http://backpack.tf/profiles/76561198049447942?time=1427439600

Using 11.

Aces High Wet Works mini suggestion

Sold for 10 Keys

http://backpack.tf/profiles/76561198202056388?time=1426865360 -> http://backpack.tf/profiles/76561198202056388?time=1426921200

Using 10.

7 Is too low for obvious reasons, and 20 is definitely too high. 9-10 Keys should be fine.

Additional Proof/Counter-Proof/Constructive Criticism/Feedback is always appreciated.