The first test of a lightbulb.

Sale 1:

https://backpack.tf/profiles/76561198314209160#!/compare/1564272000/1564876800

https://backpack.tf/profiles/76561198323565601#!/compare/1564185600/1564272000

Untrace

Sale 2:

https://backpack.tf/profiles/76561198877308962#!/compare/1566432000/1567814400

https://backpack.tf/profiles/76561198337734785#!/compare/1567814400/1567900800

QS

Sale 3:

https://backpack.tf/profiles/76561198158477444#!/compare/1566000000/1566172800

https://backpack.tf/profiles/76561198152536833#!/compare/1564444800/1570406400

Untrace

sale 4:

https://backpack.tf/profiles/76561198133048250#!/compare/1566172800/1565913600

https://backpack.tf/profiles/76561198103877010#!/compare/1566086400/1566172800

https://backpack.tf/profiles/76561198133048250#!/compare/1565913600/1566172800

tradeback

Sale 5:

https://backpack.tf/profiles/76561198133048250#!/compare/1566172800/1566345600

https://backpack.tf/profiles/76561197988251589#!/compare/1566259200/1566345600

Untrace

Sale 6:

https://backpack.tf/profiles/76561197988251589#!/compare/1566345600/1566432000

https://backpack.tf/profiles/76561198068460782#!/compare/1566345600/1566432000

https://backpack.tf/profiles/76561198061257432#!/compare/1566345600/1566432000

https://backpack.tf/profiles/76561198189381361#!/compare/1566432000/1566518400

Untrace / bulk

Sale 7:

https://backpack.tf/profiles/76561198152569578#!/compare/1569196800/1569283200

https://backpack.tf/profiles/76561198129380689#!/compare/1569196800/1569283200

https://backpack.tf/profiles/76561198302201202#!/compare/1568937600/1569283200

Untrace

Sale 8:

https://backpack.tf/profiles/76561198302201202#!/compare/1569283200/1569369600

https://backpack.tf/profiles/76561198432461884#!/compare/1569283200/1569369600

https://backpack.tf/profiles/76561198080179568#!/compare/1569283200/1569369600

Untrace then QS

Sale 9:

https://backpack.tf/profiles/76561198059836930#!/compare/1565913600/1566000000

https://backpack.tf/profiles/76561198298344239#!/compare/1553817600/1566000000

Untrace

Sale 10:

https://backpack.tf/profiles/76561198298344239#!/compare/1566000000/1566086400

https://backpack.tf/profiles/76561198070810766#!/compare/1566000000/1566086400

Sold for ~6 keys

Sale 11:

https://backpack.tf/profiles/76561198070810766#!/compare/1566000000/1566086400

https://backpack.tf/profiles/76561198156274478#!/compare/1566000000/1566086400

Sold for 7 keys

Sale 12:

https://backpack.tf/profiles/76561198156274478#!/compare/1567987200/1568160000

https://backpack.tf/profiles/76561198114635132#!/compare/1568073600/1568160000

Bulk

Sale 13:

https://backpack.tf/profiles/76561198114635132#!/compare/1569110400/1569196800

https://backpack.tf/profiles/76561198130439878#!/compare/1569024000/1569196800

Sold for TW Tit Tyro

use there

Sale 14:

https://backpack.tf/profiles/76561198130439878#!/compare/1569024000/1569196800

https://backpack.tf/profiles/76561198972294135#!/compare/1569110400/1569196800

Sold for ~8 keys

Sale 15:

https://backpack.tf/profiles/76561198972294135#!/compare/1569110400/1569196800

https://backpack.tf/profiles/76561198310264826#!/compare/1569110400/1569196800

Sold for ~7.5 keys in sweets (keys from spelled flamethrower sale)

Sale 16:

https://backpack.tf/profiles/76561198310264826#!/compare/1569283200/1569369600

https://backpack.tf/profiles/76561198400251476#!/compare/1569196800/1569369600

Sold for 9 keys

Sale 17:

https://backpack.tf/profiles/76561198400251476#!/compare/1570060800/1570147200

https://backpack.tf/profiles/76561198312677516#!/compare/1570147200/1570406400

transfer, checking histories of some keys shows they tradeback consistently:

https://backpack.tf/item/6902480203

https://backpack.tf/item/7898809140

https://backpack.tf/item/7893331058

https://backpack.tf/item/6045988138

Total sales @:

6, 7, 7.5, 8, 9, keys

buyers up to 5.5 keys,

seller at ~8.5 keys,

calling one outlier on either end,

taking 7 - 8 keys.