Resuggestion, thanks to K1ng for the info!

Deja vu.

Sale 1:

https://backpack.tf/profiles/76561198061376237#!/compare/1567641600/1567728000

https://backpack.tf/profiles/76561198210187307#!/compare/1568419200/1568505600

Untrace

sale 2:

https://backpack.tf/profiles/76561198210187307#!/compare/1572134400/1572220800

https://backpack.tf/profiles/76561198337734785#!/compare/1572134400/1572220800

Sold for ~9.5 keys (QS)

Sale 3:

https://backpack.tf/profiles/76561198064646061#!/compare/1567296000/1567382400

https://backpack.tf/profiles/76561198325595749#!/compare/1567296000/1567382400

Bulk

sale 4:

https://backpack.tf/profiles/76561198325595749#!/compare/1567641600/1567728000

https://backpack.tf/profiles/76561198101471399#!/compare/1567555200/1567728000

Sold for ~11 keys

Sale 5:

https://backpack.tf/profiles/76561198403404710#!/compare/1569801600/1569888000

https://backpack.tf/profiles/76561198021055079#!/compare/1569801600/1569888000

QS

Sale 6:

https://marketplace.tf/items/tf2/30091;5;u62

$25 / $1.82 = 13.74 keys

total sales @:

9.5, 11, 13.74 keys

buyers up to ~8.5 keys,

seller for 12 keys, dropped from ~12.5 keys, unsold for ~2 weeks,

https://backpack.tf/item/7957339351

https://bot.tf/stats/listings/MVR90N1E

https://bot.tf/stats/listings/425K2NOZ

other unsold for 12 keys:

https://bot.tf/stats/listings/MVRW7G0E

delisted / hidden, however.

calling 13.74 high,

9.5 low due to being a buy order ATT,

K1ng's Part:

Seller at 12 sold for that

https://backpack.tf/profiles/76561198337734785#!/compare/1573948800/1574035200

https://backpack.tf/profiles/76561198316071886#!/compare/1573948800/1574035200

11-12 should work.