Using sales that have occurred since the bugged unusuals were released (~16th August).

Sale 1:

Sold for Neutron Star Spirit of the Bombing Past (15.5) + ~3.5 keys in items

Seller: https://backpack.tf/profiles/76561198095407289#!/compare/1567900800/1567987200

Buyer: https://backpack.tf/profiles/76561198931721599#!/compare/1567987200/1568073600

https://backpack.tf/item/7957487005

No B/O on bot.tf

X = 19

Sale 2:

Sold for Smoking Noble (Suggestion at 13.5)

Seller: https://backpack.tf/profiles/76561198173153699#!/compare/1567296000/1567382400

Buyer: https://backpack.tf/profiles/76561197964171516#!/compare/1567209600/1567296000

https://backpack.tf/item/7956068224

https://bot.tf/stats/listings/MNLZXDEJ - B/O of 18

X = 14

Sale 3:

Sold for Terror-Watt Plug-In Prospector (10.5) + 2 keys

Seller: https://backpack.tf/profiles/76561198129011660#!/compare/1566000000/1566086400

Buyer: https://backpack.tf/profiles/76561198853723390#!/compare/1566000000/1566086400

https://backpack.tf/item/7955728880

Prospector got updated when the bugged unusuals were in circulation. Sellers are only a little lower than what the item is currently priced at, the only seller out of its range is fairly young. Will stick with its current price.

X = 13

Sale 4:

Sold for 12 keys

Seller: https://backpack.tf/profiles/76561198084692757#!/compare/1566604800/1567296000

Buyer: https://backpack.tf/profiles/76561198173153699#!/compare/1567209600/1567296000

https://backpack.tf/item/7956068224

X = 12

Sale 5:

Sold for Orbiting Fire Helmet Without a Home + ~10.5 keys in items

Seller: https://backpack.tf/profiles/76561198853723390#!/compare/1566000000/1566086400

Buyer: https://backpack.tf/profiles/76561198103302103#!/compare/1566000000/1566086400

https://backpack.tf/item/7955728880

No B/O on bot.tf

This sale will end up being fairly high, better off to exclude it.

Other Sales:

https://backpack.tf/item/7957487005 (#1)

https://backpack.tf/item/7957395793 (#2 & #3)

https://backpack.tf/item/7957215922 (#4 & #5)

https://backpack.tf/item/3757588577 (#6)

https://backpack.tf/item/2613141972 (#7)

#1

Sold for Circling Peace Sign Sky High Fly Guy

https://backpack.tf/profiles/76561198827340273#!/compare/1567814400/1567900800

https://backpack.tf/profiles/76561198095407289#!/compare/1567814400/1567900800

Fly Guy has sellers pretty close to the buyers on this item. Gonna be low. Excluding.

#2

Sold with keys for DBD Neckwear

https://backpack.tf/profiles/76561198137163870#!/compare/1566086400/1566000000

https://backpack.tf/profiles/76561198097974718#!/compare/1565913600/1566086400

Using on the Neckwear.

#3

Sold for Kill-a-Watt Broadband Bonnet + 1 key

https://backpack.tf/profiles/76561198097974718#!/compare/1566086400/1566172800

https://backpack.tf/profiles/76561198302161698#!/compare/1566086400/1566172800

Low here (suggestion at 6 on the Bonnet), high on the bonnet. Excluding.

#4

Untraceable

https://backpack.tf/profiles/76561198210713517#!/compare/1566345600/1566518400

https://backpack.tf/profiles/76561198093501381#!/compare/1566432000/1566518400

#5

Untraceable

https://backpack.tf/profiles/76561198093501381#!/compare/1566518400/1566604800

https://backpack.tf/profiles/76561198246462252#!/compare/1566000000/1568505600

#6

Untraceable

https://backpack.tf/profiles/76561198382394358#!/compare/1565654400/1566000000

https://backpack.tf/profiles/76561198253239059#!/compare/1565308800/1566172800

#7

Sold for 8 keys?

https://backpack.tf/profiles/76561198283258068#!/compare/1568073600/1568160000

https://backpack.tf/profiles/76561198311498888#!/compare/1568073600/1568160000

Smoking Noble:

https://backpack.tf/suggestion/5d86d2606780720f251b2ccb

Sellers:

https://i.imgur.com/PejLmYF.png

https://backpack.tf/item/7957395793 - 16 keys

https://backpack.tf/item/7956068224 - 17 keys

https://backpack.tf/item/7956796531 - 25 keys

Sales at:

12

13

14

19

Two sales are going to be above the sellers (sales 1 and 5). They look like outliers with the amount of cheaper sales, as supported by unusable sales #1, #3 & #7. Excluding 19.

Going with 12-14.