Just gonna copy paste the proof from the previous suggestions:

1st sale: $5250 USD

https://backpack.tf/item/1967725200

https://imgur.com/a/S55WeoP

https://imgur.com/a/3YH2qW7

First instalment of $3600 USD

https://imgur.com/a/eICKC08

Second instalment of $269.5 USD

https://imgur.com/a/of3bkNm

Third instalment of $650 USD

https://imgur.com/a/ZYTv4i6

Fourth instalment of $730.5 USD. Excess funds are for a purchase to be suggested at a later date.

Confirmation from Mistress: https://imgur.com/a/0WEcmpc

$3600 + $269.5 + $650 + $730.5 = $5250

Key buyers currently at 1.85 USD. Last week I sold 2200 keys for 1.9 USD. Taking 1.9 to be a fair paypal/wire key price. $5250/1.9 = 2763.16 keys. Rounding to 2800.

2nd sale:

https://backpack.tf/profiles/76561198056793885#!/compare/1616544000/1616630400

https://backpack.tf/profiles/76561198026744290#!/compare/1616371200/1616630400

https://imgur.com/a/p4N6fBW - thanks for the screenshots Manbear

Sold for:

Green Energy Virtual Viewfinder - https://backpack.tf/suggestion/6099596bda873e30e615324e - 1950 keys

2100 keys in terms of cash (at least, sort of agreed at the time)

Cash:

https://imgur.com/a/l0ao5kl - initial trade and $2850 @ $1.90 per key, $2850 / $1.90 = 1500 keys

https://imgur.com/a/V7ZBBWG - final installment of $1140 - May 24th

Keys as of May 24th:

Buyers:

https://forums.backpack.tf/topic/76054-%F0%9F%92%B2-buying-tf2-keys-for-168-paypal-negotiable/ - $1.68

https://forums.backpack.tf/topic/38397-%F0%9F%94%A5frost-is-buying-keys-for-168-usd-paypal-500-trust-ratings%E2%9C%85-no-rep-needed/ - $1.68

https://forums.backpack.tf/topic/66342-buying-keys-for-170-paypal-may-2021-%F0%9F%94%A5/ - $1.70

https://forums.backpack.tf/topic/66758-wtb-buying-keys-for-171-usd-via-paypal380-rep/ - $1.71

https://forums.backpack.tf/topic/68510-buying-keys-for-170-backpacks-via-paypal-350-rep/ - $1.70

https://forums.backpack.tf/topic/76871-buying-keys-169-each-buying-special-keys-ref-tools-backpacks-paypal/ - $1.69

https://forums.backpack.tf/topic/77467-wtb-buying-backpacks-keys-at-170-mvm-tod-tix-at-080-via-paypal-venmo-zelle-cashapp/ - $1.70

https://forums.backpack.tf/topic/76862-buying-tf2-keys-with-paypal-for-170-usd-or-%E2%82%AC138-each/ - $1.70

Buyers are mostly around $1.70

Sellers:

https://forums.backpack.tf/topic/78113-selling-keys-182-key-cashapp-paypal-400-stock/ - $1.82

https://forums.backpack.tf/topic/75270-selling-keys-for-172-paypalvenmozellepayoneercashapp-trusted-seller-2000-stock/ - $1.72

https://forums.backpack.tf/topic/76949-selling-keys-for-zelle-crypto-venmo-cash-app-for-171-100%E2%80%99s-to-1000%E2%80%99s-in-stock-35000-keys-in-recent-rep/ - $1.71

https://forums.backpack.tf/topic/75702-selling-900-keys-175-600-tour-of-duty-tickets-085-paypalzelle-keys-17-btc/ - $1.75

https://forums.backpack.tf/topic/76089-selling-1236-keys-173-usd/ - $1.73

https://forums.backpack.tf/topic/77688-selling-600-keys-for-171-venmo-172-paypal/ - $1.72 PayPal

https://forums.backpack.tf/topic/78028-s-93-keys-for-175-each-paypal/ - $1.75

https://forums.backpack.tf/topic/77499-selling-keys-for-173-usd-paypalwise-1300-keys-stock/ - $1.73

I think it's honestly rather close, sellers are probably centred around $1.73 I suppose

$1140 / $1.70 = 670.59 keys

$1140 / $1.73 = 658.96 keys

1950 + 1500 + 671 = 4121 keys

1950 + 1500 + 659 = 4109 keys

Both round down to 4100 keys, gonna run with that here given keys running wild between when the trade was initiated and when it concluded.

Taking as 4100

Sales

2800, 4100

Fat range of 2800 - 4100 keys here

Congrats on the purchase Manbear! Another awesome antlers that I get to price :D