Item 1:

https://backpack.tf/item/2863577478

Sale 1:

https://backpack.tf/profiles/76561198069530301#!/compare/1768780800/1768867200

https://backpack.tf/profiles/76561198071230830#!/compare/1768694400/1768867200

https://imgur.com/a/gnSwq2F - Credits Rob

Sold for 370 keys pure

Sale 2:

Unsure of item history

https://steamcommunity.com/market/listings/440/Collector%27s%20Widowmaker%20Chemistry%20Set

https://imgur.com/a/cx0UlYH

Sold for $297.38AUD on the 24th of Oct

Keys were ~$3.08 on the 24th - https://imgur.com/a/mjGX5fh

297.38/3.08

= 96.55

Rounding up to 97

I have just realised I did it for the 25th not the 24th, but even still the key didn't shift that much that date

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Sale(s):

370, 97

I am excluding 97 not it being almost out of date, seems like a pretty big quicksell. The person who bought it could spend 11 ref to fill it then resell the collector to auto buyers at 266. So around a 196 key profit automatically.

Going with 370 keys flat