https://backpack.tf/item/7894207605

whole lotta scrap.tf lol, skipping allat

//

https://marketplace.tf/items/tf2/30769;5;u29

$28 = 16 keys - 14 key buyout https://bot.tf/stats/listings/MVRJWX0W

$29.99 = 18 keys

https://backpack.tf/item/6452448780

//

https://backpack.tf/profiles/76561198088756424#!/compare/1582848000/1582934400

https://backpack.tf/profiles/76561198053720151#!/compare/1582848000/1582934400

Bulk

//

https://backpack.tf/profiles/76561198053720151#!/compare/1583193600/1583280000

https://backpack.tf/profiles/76561198173961719#!/compare/1583020800/1583280000

Bulk, might be scrap.tf

//

https://backpack.tf/profiles/76561198173961719#!/compare/1583020800/1583280000

https://backpack.tf/profiles/76561198177719569#!/compare/1583193600/1583280000

Untraceable

//

https://backpack.tf/profiles/76561198177719569#!/compare/1583280000/1583366400

https://backpack.tf/profiles/76561198142892266#!/compare/1583280000/1583798400

Untraceable

//

https://backpack.tf/item/7033784745

i skip tradeback

//

https://backpack.tf/profiles/76561198244442548#!/compare/1585008000/1585008000

https://backpack.tf/profiles/76561198315075484#!/compare/1584835200/1585008000

looks like 12 keys but cant be sure

//

https://backpack.tf/profiles/76561198093518222#!/compare/1585699200/1586044800

https://backpack.tf/profiles/76561198015547078#!/compare/1583712000/1584144000

This is the April Marketplace sale

//

https://backpack.tf/profiles/76561198093518222#!/compare/1587081600/1587168000

https://backpack.tf/profiles/76561198026360445#!/compare/1587081600/1587168000

It looks like 15 keys but histories or ID don't match, might be that the buyer bought all the keys before trading for the Herald's Helm

//

https://backpack.tf/profiles/76561198026360445#!/compare/1587427200/1587513600

https://backpack.tf/profiles/76561198096519024#!/compare/1586649600/1587513600

Bulk

//

https://backpack.tf/profiles/76561197972236985#!/compare/1582156800/1582934400

https://backpack.tf/profiles/76561198277197814#!/compare/1582588800/1584230400

Untraceable

//

https://backpack.tf/profiles/76561198249078668#!/compare/1586131200/1586217600

https://backpack.tf/profiles/76561198252999692#!/compare/1586217600/1586304000

Untraceable

//

https://backpack.tf/profiles/76561198252999692#!/compare/1586304000/1586390400

https://backpack.tf/profiles/76561198993686702#!/compare/1586304000/1586390400

Untraceable

//

https://backpack.tf/profiles/76561198123224716#!/compare/1585094400/1585180800

https://backpack.tf/profiles/76561198106206016#!/compare/1585094400/1585180800

Aces High Ubersternmann, should be used there

//

https://backpack.tf/profiles/76561198106206016#!/compare/1585353600/1585440000

https://backpack.tf/profiles/76561198170442766#!/compare/1585180800/1585526400

15 keys, near ID match

//

https://backpack.tf/profiles/76561198170442766#!/compare/1585526400/1585958400

https://backpack.tf/profiles/76561198254861074#!/compare/1585440000/1585526400

Untraceable

//

https://backpack.tf/profiles/76561198096901956#!/compare/1585785600/1585872000

https://backpack.tf/profiles/76561198254861074#!/compare/1585785600/1585872000

Tesla Coil Hot Dog, high here and low there

//

https://backpack.tf/profiles/76561198096901956#!/compare/1585958400/1586044800

https://backpack.tf/profiles/76561197961420647#!/compare/1585872000/1586044800

8 keys & refined, low

//

https://backpack.tf/profiles/76561197961420647#!/compare/1586304000/1586390400

https://backpack.tf/profiles/76561198154121648#!/compare/1585353600/1586390400

Bulk

//

Sales:

12?

14

15?

15

18

Going with 14-18