History 1: https://backpack.tf/item/8397997862

Sold on marketplace.tf then re-deposited to marketplace.tf

Compares tell us the first MP sale in the history happened between July 10 and July 30

https://backpack.tf/profiles/76561198216485851#!/compare/1594339200/1596067200

Last seen in MP bot on September 3 and sale on September 9, this is most likely the history for that too

Marketplace.tf sales: https://marketplace.tf/items/tf2/30842;5;u3032

(UNTRACEABLE) June 22 2020: $49.95 (key=$1.98, 25.23 keys) ~25 keys

(UNTRACEABLE) June 24 2020: $33.01 (key=$2.00, 16.5 keys) ~17 keys

(History 1) July 14 2020: $37.50 (key=$1.93, 19.43 keys) ~19 keys

(UNTRACEABLE) August 15 2020: $30.50 (key=$1.81, 16.85 keys) ~17 keys

(UNTRACEABLE) August 30 2020: $41.50 (key=$1.88, 22.07 keys) ~22 keys

(History 1) September 9 2020: $50 (key=$1.89, 26.45 keys) ~26 keys

We have 17, 17, 19, 22 , 25 and 26

Unsuccessful unsolds at 24 keys in the past counter 25 and 26, 25 is also the oldest sale

Day listed:https://bot.tf/stats/listings/Y9Q9QP7X

Day before removal: https://bot.tf/stats/listings/Y808DKN9

Going with 17-22 keys