2 years outdated... Big crash incoming. One usable sale.

Sale #1:

Sold on mp.tf, May 27, 2019 for $279.99

https://marketplace.tf/shopitem/76561198049278733/30362;5;u19;strange

Keys that day were $1.81:

https://marketplace.tf/items/5021;6/Mann%20Co.%20Supply%20Crate%20Key

$279.99/1.81= 154.69. Rounding to 155.

May look like quicksell- but with buyers at 101 keys (http://prntscr.com/nwedxa), not considering this a quicksell.

Sale #2. (Invalid, ignoring- No mini on medigun, unable to create one.):

https://backpack.tf/profiles/76561198082401774#!/compare/1557964800/1558137600

Sale #3 (Not actually a sale- deposit into mp.tf, ignoring):

https://backpack.tf/profiles/76561198082401774#!/compare/1558396800/1558915200

Looks like this was the marketplace deposit. Sold on 27th. Comparing final person on history confirms this. Hat appeared in inventory on 27th- same time the hat sold on marketplace.

https://backpack.tf/profiles/76561198049278733#!/compare/1558828800/1558915200

Strangifier exists for this hat. Ignoring the fact that it sold as a Strange.

In conclusion: 155 keys.