Update!

Sale: https://marketplace.tf/items/tf2/615;5;u34 - 13.99/1.85 = ~7.5

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Credits to Surs:

traced 7 keys here

https://backpack.tf/profiles/76561198850274253#!/compare/1596585600/1596672000

https://backpack.tf/profiles/76561199061291009#!/compare/1596672000/1597536000

buyout was 6 keys, 43 ref, ends up rounding to 7 anyways

https://bot.tf/stats/listings/MVQZ6ZQ3

was exchanged from stn to qs store to mannco

https://backpack.tf/item/676190033

looks like bender sold theirs for 7 too

https://backpack.tf/profiles/76561198335791307#!/compare/1596924000/1597010400

https://bot.tf/stats/item?def=615&q=5&ef=Bubbling&craft=1&aus=0&ks=0&source=browser_script

https://gyazo.com/c5af9f4a95243f60855407e065376570

7.5 is now outdated, and bender took quite a long time to sell at 7. 7 flat may be better here, but wait for a mods comment just in case.

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Additional by Xergoyf:

I agree, 7 flat should be better here. Bender had it at 7 for at least 2 months, possibly WAY longer according to the history

https://bot.tf/stats/listings/M0OJOVXQ

https://backpack.tf/item/1156258211

https://stntrading.eu/item/tf2/Unusual+Bubbling+Birdcage - stn sales were also likely much lower as well

https://backpack.tf/item/6772534914

https://backpack.tf/item/676190033

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7 flat it is