Counter suggestion

Sale #1 - 38 keys

https://backpack.tf/profiles/76561198231929776#!/compare/1552521600/1552608000

https://backpack.tf/profiles/76561198250447118#!/compare/1550880000/1552608000

Sale #2 - Untrace? looks like 33 keys but no histories line up

https://backpack.tf/profiles/76561198043058406#!/compare/1549843200/1550016000

https://backpack.tf/profiles/76561198823820018#!/compare/1549843200/1550188800

Sale #3 - Untrace? looks like 35 keys but no histories line up

https://backpack.tf/profiles/76561198126887938#!/compare/1552003200/1552089600

https://backpack.tf/profiles/76561198358137990#!/compare/1551830400/1552003200

Sale #4 - Omn Orb Berlin Brain + Aces Robo Glove + 3 keys + Bread Head

https://backpack.tf/profiles/76561198097589593#!/compare/1546992000/1547078400

https://backpack.tf/profiles/76561198119149660#!/compare/1546905600/1546992000

Taking 23.5 + 8 + 3 + 1.75 = 36.25, rounded to 36 keys

https://marketplace.tf/items/30814;5;u107/Neutron%20Star%20Lil'%20Bitey

marketplace sales

feb 15: $75/1.8=42 keys but B/o cap at 40(thanks for the information doge) https://backpack.tf/suggestion/5ca4294e6780726aa16c9921#comment-5ca43e5067807276eb65228b

jan 19th: $70/1.8=~39 keys

Taking 36 - 40 keys