2 years outdated hmm...

Sale #1 -

50 keys

https://backpack.tf/profiles/76561198011321852#!/compare/1506038400/1506124800

Sale #2 -

dunno

https://backpack.tf/profiles/76561198325838670#!/compare/1502323200/1502409600

Sale #3 -

Bulk for that RL

https://backpack.tf/profiles/76561198325838670#!/compare/1502150400/1502236800

Sale #4 -

Smoking Vive + Swirl Battin + 2 keys in sweets

https://backpack.tf/profiles/76561198112569767#!/compare/1501459200/1501545600

B/O of 50 keys, capping at that - http://www.tf2outpost.com/trade/29284877

Sale #5 -

Hellish Brewed (33) + Mega Strike Fubar (25)

https://backpack.tf/profiles/76561198112569767#!/compare/1501545600/1501977600

Cannot find any recent sales on the brewed, capping at the 33 key seller!

Taking 58, rounding to 60

B/O of 60

Sale #6 -

Mega-Bulk

https://backpack.tf/profiles/76561198039026768#!/compare/1499644800/1499731200

Taking 50 - 60 keys