2 years

Thanks to Toom's server I can find these outdated hats / b/o drops yipee (Suggestor role)

Sale #1:

https://backpack.tf/item/10974279261 ~ all qs store bot transfers

Sale #2:

https://backpack.tf/item/14030343157

https://backpack.tf/profiles/76561199072654974#!/compare/1785888000/1785974400 ~ 10 keys + 31 ref matches nearID

https://backpack.tf/profiles/76561198036525963#!/compare/1784332800/1785974400

Sale #3:

https://backpack.tf/profiles/76561198332294344#!/compare/1782172800/1782259200 ~ 0.66 ref matches

https://backpack.tf/profiles/76561199072654974#!/compare/1782086400/1782172800

Sale #4:

https://backpack.tf/profiles/76561198850274253#!/compare/1782086400/1782172800 ~ 13 keys + 30 ref matches

https://backpack.tf/profiles/76561198332294344#!/compare/1782000000/1782172800

Considering 13 keys + 30 ref was redumped, and the fact we have a seller at 10.59 for a while, going to exclude sale 3 https://i.imgur.com/0HZInsf.png and take 10 keys flat (10 keys + 31 ref, with keys at 64 ref, rounds down to 10)