TEAM 4 EVENT

Purple Energy Trencher’s Topper

New price: 50-55 keys

[proof below]

SALE #1 = invalid

https://backpack.tf/profiles/76561198411126009#!/compare/1509926400/1511136000

Bulk? Histories of the other hats match both with seller/buyer.

https://backpack.tf/item/6039557100

Looks like a bunch of friends/alts brokering or borrowing.

SALE #2 = 50 keys

https://marketplace.tf/items/30336;5;u10

Sold for $99 ( / $1,99 ) = 50 keys.

SALE #3 = 55 keys

https://backpack.tf/profiles/76561198076020691#!/compare/1507939200/1508025600

https://backpack.tf/profiles/76561198109739408#!/compare/1507939200/1508025600

Sold for 55 keys.

SUMMARY

Sales: 50 / 55 keys

Sellers: 70 keys

https://gyazo.com/ea7daf9dcf615edc5e792ddc6f06dd1c

Going with 50-55 keys.