Re-suggestion, thanks to Mindacos for the info!

Sale 1:

https://backpack.tf/profiles/76561198199624411#!/compare/1531440000/1531526400

https://backpack.tf/profiles/76561198043936328#!/compare/1531440000/1531526400

Bulk.

Sale 2:

https://backpack.tf/profiles/76561198116553254#!/compare/1529798400/1531353600

Untrace.

Sale 3:

https://backpack.tf/profiles/76561198102349291#!/compare/1527379200/1527552000

https://backpack.tf/profiles/76561198196947639#!/compare/1527292800/1527379200

Using there.

Sale 4:

https://backpack.tf/profiles/76561198196947639#!/compare/1531267200/1531353600

https://backpack.tf/profiles/76561198255785324#!/compare/1531008000/1531353600

Bulk.

Sale 5:

https://backpack.tf/profiles/76561198255785324#!/compare/1531353600/1531440000

https://backpack.tf/profiles/76561198048610662#!/compare/1530489600/1531440000

Bulk

Sale 6:

https://backpack.tf/profiles/76561198048610662#!/compare/1531440000/1531526400

https://backpack.tf/profiles/76561198093673699#!/compare/1530576000/1531526400

Sold for 17 keys

Sale 7:

https://backpack.tf/profiles/76561198078864424#!/compare/1527292800/1528070400

https://backpack.tf/profiles/76561198164036774#!/compare/1527984000/1528070400

Sold for DBD Hedge

Hedge Mini:

https://backpack.tf/suggestion/5b34c32544325a6a4062dca6

Taking mods suggested price range in comments of 16-22, which totals 19 keys.

Sale 8:

https://backpack.tf/profiles/76561198164036774#!/compare/1528416000/1528502400

https://backpack.tf/profiles/76561198179529599#!/compare/1528416000/1528502400

Sold for keys, untrace.

Sale 9:

https://backpack.tf/profiles/76561198179529599#!/compare/1528588800/1528675200

Sold for 20 keys

Sale 10:

https://backpack.tf/profiles/76561198224648164#!/compare/1528588800/1528675200

https://backpack.tf/profiles/76561198022370781#!/compare/1528588800/1528675200

Sold for keys. untrace.

Sale 11:

https://backpack.tf/profiles/76561198022370781#!/compare/1528675200/1528761600

https://backpack.tf/profiles/76561198055215581#!/compare/1528675200/1528761600

Sold for OF Wrap, used there.

Sale 12:

https://backpack.tf/profiles/76561198055215581#!/compare/1528675200/1528761600

https://backpack.tf/profiles/76561198189133167#!/compare/1522022400/1528761600

Sold for 9 keys + ~10 keys in sweets

Total is 19 keys

Sale 13:

https://backpack.tf/profiles/76561198189133167#!/compare/1530835200/1531785600

https://backpack.tf/profiles/76561198226262240#!/compare/1530662400/1530835200

Untrace.

Sale 14:

https://backpack.tf/profiles/76561198226262240#!/compare/1530835200/1530921600

https://backpack.tf/profiles/76561198085116555#!/compare/1530835200/1530921600

Bulk.

Mindacos' Part:

Might as well take a look at new sales while we're at it:

Sold for 22 Keys

https://backpack.tf/profiles/76561197988794604#!/compare/1531353600/1531785600

Sold for 17 Keys

https://backpack.tf/profiles/76561198048610662#!/compare/1531440000/1531526400

Sold for an Electric Hat Protector Universal Translator(14.5 Keys) and ~10.5 Keys in Sweets(~25 Keys total, Outlier)

https://backpack.tf/profiles/76561198174369657#!/compare/1531440000/1531612800

Welp, looks like the previous range was fine after all despite the DBD head hedge needing a resuggestion. I wouldn't exclude 17 keys since we don't have concrete buyers for it. 17-22 should be fine after all.