3 months, small update since the previous suggestion is now outdated.

SALES

Sold for 29 keys

https://backpack.tf/profiles/76561198061779536#!/compare/1588464000/1588550400

https://backpack.tf/profiles/76561198178324098#!/compare/1588464000/1588723200

While histories nor ID's match, since the buyouts match, it's likely this was indeed the sale. (While it is most likely for 29 keys, if by chance this is the MTPF sale below at 35 keys, it would end up capping at 29 anyways, which would nonetheless work out for this suggestion).

Buyout was also 29 keys

https://bot.tf/stats/listings/4ZPN7P70

Untrace

https://backpack.tf/profiles/76561198189106033#!/compare/1591833600/1592092800

https://backpack.tf/profiles/76561198121359800#!/compare/1538092800/1593388800

Sold for Searing Plasma Boxcar Bomber (Open suggestion at 26 keys) + Terror-Watt Valley Forge (10.5 keys)+ 5x non craft festivizers (41.17 x 5 = 205.85 refined)+ Bedouin Bandana (4.35 keys)

https://backpack.tf/profiles/76561198258595884#!/compare/1589932800/1590019200

https://backpack.tf/profiles/76561198069472159#!/compare/1589932800/1592784000

205.85 refined converted to keys = 3.546 keys

26 + 10.5 + 4.35 + 3.546 = 44.396 rounding to 44 keys

Buyout was 35 keys, there was also a seller at 34 during the same time.

https://bot.tf/stats/listings/4WX82DPX

Mini for Boxcar Bomber:

https://backpack.tf/suggestion/5f115c4d51f6a2107a30b499

MARKETPLACE

https://marketplace.tf/items/tf2/30658;5;u121

59.99 on April 30 (59.99/1.82 = 32.96 rounding to 33 keys) - During the time of the sale, there was a seller at 29 keys: https://bot.tf/stats/listings/4P0517R3

59.99 on May 7 (59.99/1.88 = 31.91 rounding to 32 keys)

59.99 on May 10 (59.99/1.9 = 31.57 rounding to 32 keys)

CLASSIFIEDS:

https://gyazo.com/f1fcbb51a9536134b4376018aa609af9

Seller at 32 for 4 days.

SUMMARY:

1 @ 29 keys

2 @ 32 keys

1 @ 33 keys

1 @ 35 keys

CONCLUSION:

33 and 35 seem high due to the past sellers during the time of the sales. As well as the current seller at 32, 33+ seems high. Excluding both 33 and 35.

Taking 29-32 keys here.