Wow this prestige is looking nice.

SALE 1

sold to stn bot

https://backpack.tf/profiles/76561198046455935#!/compare/1563148800/1563235200

SALE 2

sold with holy grail taunt: party trick for orbiting fire whoopee cap

https://backpack.tf/profiles/76561198011912310#!/compare/1557446400/1557619200

https://backpack.tf/profiles/76561198086368143#!/compare/1557532800/1557619200

whoopee cap is indate, holy grain taunt is outdated, taking a mini for it.

13 - 3.685 = 9.315 rounding to 9 keys.

quick mini for holy grail taunt: party trick

https://gyazo.com/42f0aacc24e303e4d9a8634e6be780e6

sellers from 3.37 to 4, taking the avg of 3.685 here. (buyers are at 3.15 as well)

SALE 3

unknown

https://backpack.tf/profiles/76561198086368143#!/compare/1557705600/1557792000

https://backpack.tf/profiles/76561197971881612#!/compare/1556150400/1557792000

SALE 4

sold for kaw halogen head lamp

https://backpack.tf/profiles/76561197971881612#!/compare/1557792000/1558051200

https://backpack.tf/profiles/76561198412056118#!/compare/1557964800/1558051200

head lamp is outdated @ 3 years. can use this for that as that as fewer sales.

SALE 5

unknown

https://backpack.tf/profiles/76561198088810276#!/compare/1555804800/1556496000

https://backpack.tf/profiles/76561198035005297#!/compare/1555200000/1556064000

also outdated as of today.

SALE 6

unknown

https://backpack.tf/profiles/76561198841915457#!/compare/1558137600/1558828800

https://backpack.tf/profiles/76561198217228241#!/compare/1557360000/1559692800

SALE 7

unknown

https://backpack.tf/profiles/76561198340634356#!/compare/1558310400/1558396800

SALE 8

sold with holy grail taunt: disco fever for tw toy soldier

https://backpack.tf/profiles/76561198119864085#!/compare/1557273600/1557792000

https://backpack.tf/profiles/76561198107344329#!/compare/1557705600/1557792000

both indate.

12.5 - 5.25 = 7.25 rounding to 7.5 keys

SALE 9

unknown

https://backpack.tf/profiles/76561198334598690#!/compare/1560988800/1561075200

https://backpack.tf/profiles/76561198318138402#!/compare/1560988800/1561075200

SALE 10

sold for 11 keys

https://backpack.tf/profiles/76561198024867201#!/compare/1558569600/1558656000

https://backpack.tf/profiles/76561198200475465#!/compare/1558569600/1558656000

SALE 11

sold for 7 keys + 18.77 refined

https://backpack.tf/profiles/76561198355092203#!/compare/1559779200/1559865600

would round up to 7.5 keys

SALE 12

not sure, but 3 keys were involved

https://backpack.tf/profiles/76561198355092203#!/compare/1559779200/1559865600

https://backpack.tf/profiles/76561198355092203#!/compare/1559606400/1559692800

SALE 13

unknown

https://backpack.tf/profiles/76561198305494036#!/compare/1557360000/1557446400

https://backpack.tf/profiles/76561198161952878#!/compare/1557360000/1557446400

SALE 14

unknown

https://backpack.tf/profiles/76561198289002382#!/compare/1560556800/1560643200

https://backpack.tf/profiles/76561198454615761#!/compare/1560556800/1560643200

SALE 15

sold to bot

https://backpack.tf/profiles/76561198171028639#!/compare/1560729600/1560816000

SALE 15

sold for 7 keys + 16 refined

https://backpack.tf/profiles/76561198149140991#!/compare/1560729600/1561161600

would round up to 7.5 keys

SALE 16

sold for keys, although im not sure how many

https://backpack.tf/profiles/76561198305676157#!/compare/1557532800/1557619200

https://backpack.tf/profiles/76561198251433444#!/compare/1557532800/1557619200

b/o seems to be 8 keys + 4 ref

https://bot.tf/stats/listings/MX7GJ87M

if it was based on b/o, would round down to 8.

SALE 17

sold for 7 keys

https://backpack.tf/profiles/76561198057338806#!/compare/1560556800/1561334400

SALE 18

sold for 9 keys

https://backpack.tf/profiles/76561198340960601#!/compare/1562889600/1562976000

SALE 19

unknown

https://backpack.tf/profiles/76561198086708643#!/compare/1558742400/1558828800

7 marketplace sales

18.8 on may 8 (18.8 / 1.8 = 10.44 rounding to 10 keys)

18.8 on may 21 (18.8 / 1.81 = 10.38 rounding to 10 keys)

5.5 on may 25 (5.5 / 1.82 = 10.32 rounding to 10 keys)

18.8 on may 29 (18.8 / 1.81 = 10.38 rounding to 10 keys)

17.46 on june 13 (17.46 / 1.82 = 9.59 rounding to 9.5 keys)

16.93 on june 25 (16.93 / 1.83 = 9.25 rounding to 9.5 keys)

16.93 on july 14 (16.93 / 1.82 = 9.3 rounding to 9.5 keys)

https://marketplace.tf/items/tf2/30839;5;u3005

classifieds at the time of making this suggestion.

https://gyazo.com/fb44f0b6d1f1b49729c608fb5d0eaa56

sales at 7, 7.5, 7.5, 7.5, 8, 9, 9, and 11. marketplace sales at 9.5, 9.5, 9.5, 10, 10, 10, and 10. 7 is low due to buyers. 11 is high due to many sales at lower. taking a range of 7.5 - 10 keys here.