Resuggestion, thanks to LeROY for the extra info and clarification!

Sale 1:

https://backpack.tf/profiles/76561198067449563#!/compare/1529107200/1568678400

https://backpack.tf/profiles/76561198232041512#!/compare/1568592000/1568678400

Untrace

sale 2:

https://backpack.tf/profiles/76561198232041512#!/compare/1569283200/1569369600

https://backpack.tf/profiles/76561198251960730#!/compare/1569283200/1569369600

Looks high

Sale 3:

https://backpack.tf/profiles/76561198251960730#!/compare/1569801600/1569888000

https://backpack.tf/profiles/76561198135935874#!/compare/1569715200/1569801600

Untrace

sale 4:

https://backpack.tf/profiles/76561198135935874#!/compare/1571356800/1571443200

https://backpack.tf/profiles/76561198310375190#!/compare/1571184000/1571529600

Bulk(?)

Sale 5:

https://backpack.tf/profiles/76561197994697258#!/compare/1564617600/1564704000

https://backpack.tf/profiles/76561198006136307#!/compare/1564617600/1564704000

Sold for Showstopper Robics + Spooky Party + 29 keys

Party Mini:

https://backpack.tf/suggestion/5dabf8f8d381725aa35eb2d2

Suggestion for 21 keys

Mannrobics Mini:

https://backpack.tf/suggestion/5dabfb92d381725dee1c8a58

Suggestion for 16.5 keys

Total is 66.5 keys

https://bot.tf/stats/listings/YDL1LE0K

B/O of 75 keys

Sale 6:

https://backpack.tf/profiles/76561198006136307#!/compare/1565136000/1565222400

https://backpack.tf/profiles/76561197994697258#!/compare/1565136000/1565222400

Bulk

Sale 7:

https://backpack.tf/profiles/76561197994697258#!/compare/1565222400/1565308800

https://backpack.tf/profiles/76561198052952015#!/compare/1565222400/1565308800

Untrace

Sale 8:

https://backpack.tf/profiles/76561198052952015#!/compare/1568160000/1569715200

https://backpack.tf/profiles/76561198103899658#!/compare/1568160000/1568246400

Sold for 54 keys

Sale 9:

https://backpack.tf/profiles/76561198103899658#!/compare/1568419200/1568505600

https://backpack.tf/profiles/76561198441051418#!/compare/1568332800/1568505600

Sold for 64 keys

Sale 10:

https://backpack.tf/profiles/76561198441051418#!/compare/1570147200/1570233600

https://backpack.tf/profiles/76561198258264645#!/compare/1570147200/1570233600

Bulk

Sale 11:

https://backpack.tf/profiles/76561198258264645#!/compare/1570233600/1570147200

https://backpack.tf/profiles/76561198301015840#!/compare/1570233600/1567987200

https://backpack.tf/profiles/76561198258264645#!/compare/1571011200/1571184000

tradeback

Sale 12, 13:

https://marketplace.tf/items/tf2/110;5;u8

$99 / $1.81 = 54.70 keys

$100 / $1.82 = 54.95 keys

Total sales @:

54, 54.70, 54.95, 64, 66.5 keys

buyers up to 53 keys, one buyer at 55 keys, newish.

calling 54 low,

LeROY’s Part:

Sale 3) It was the $100 sale on mplc. Sold after a 4-5 days by buyer in Sale 2 which was considered high and should therefore be excluded. Adding that it was a sale to buy-order.

Sale 4) I sold it for 69 keys. Keys show in 1st link you posted. 2nd link is not my buyer -see New sale I posted

https://backpack.tf/profiles/76561198135935874#!/compare/1571356800/1571443200

Adding trade history screen: https://imgur.com/U1qClh2

B/O: https://bot.tf/stats/listings/4KR2XV08

New Sale) Seems to have been traded instantly in this.. sale/transaction:

https://backpack.tf/profiles/76561198310375190#!/compare/1571184000/1571529600

https://backpack.tf/profiles/76561198038441461#!/compare/1571443200/1571529600

Bulk

with another sale at 69 keys,

taking 55 - 69 keys.

Linking previous suggestion:

https://backpack.tf/suggestion/5dabfc42d381725e7f0583a8