Resuggestion, thanks to Xergoyf for the info!

Sale 1:

https://backpack.tf/profiles/76561198230732648#!/compare/1589328000/1589414400

https://backpack.tf/profiles/76561198195760538#!/compare/1593648000/1593907200

Untrace

sale 2:

https://backpack.tf/profiles/76561198195760538#!/compare/1593648000/1593907200

https://backpack.tf/profiles/76561198101398885#!/compare/1593820800/1593907200

Sold for Planets Defiant + ~3 keys in sweets

Defiant Mini:

https://backpack.tf/suggestion/5f24c53b15793917da012545

Suggestion for 10 keys

Total is 13 keys

sale 3:

https://backpack.tf/profiles/76561198101398885#!/compare/1593907200/1593993600

https://backpack.tf/profiles/76561198134645336#!/compare/1593907200/1593993600

Sold for Stormy Gonzilla(11)

sale 4:

https://marketplace.tf/items/tf2/30958;5;u18

$15 / $1.98 = 7.58 keys

https://backpack.tf/item/7512996588

Total sales @:

7.5, 11, 13 keys

buyers up to ~6.5 keys,

calling 7.5 low,

Xergoyf's Part:

https://imgur.com/a/bwTVR6N - stn is selling one for 9 keys 42 ref rn

https://backpack.tf/item/7176338533 - been there for ~3.5 weeks

Especially given the lack of a buyout, I think 13 is the outlier, not 7.5. Nothing really counters 7.5 so I think it should be included.