Giving this a try, a few trades are showing up on gladiator

Gladiator stats:

https://gladiator.tf/sales?item=Horseless%20Headless%20Horsemann%27s%20Head

Link of timestamp at time of suggestion:

https://gladiator.tf/sales?item=Horseless%20Headless%20Horsemann%27s%20Head&at=2021-05-22T01:46:27.720Z

Past 7 days:

0 sold

1 bought at 24 Keys 0.22 Ref

past 30 days:

1 sold at 27 Keys

2 bought at 24 Keys 0.22 Ref

-Item 1-

https://backpack.tf/item/180338423

Trade 1:

https://backpack.tf/profiles/76561199004803157#!/compare/1615852800/1616025600

https://backpack.tf/profiles/76561198123975074#!/compare/1615852800/1615939200 // seller

untraceable

-Item 2-

https://backpack.tf/item/166239046

Trade 1:

https://backpack.tf/profiles/76561199029144449#!/compare/1617667200/1620864000

https://backpack.tf/profiles/76561199102407070#!/compare/1620518400/1620691200 // seller

unclear, untraceable in sellers bp

Classifieds:

https://backpack.tf/classifieds?item=Horseless+Headless+Horsemann%27s+Head&quality=6&tradable=1&craftable=1&australium=-1&killstreak_tier=0

1 seller at 30 Keys

2 pages of buyers at 24 Keys

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Surprisingly only 2 traded recently, I may have missed a trade but that should be it.

Quite a few strangifiers have been traded recently (I would know) so that might be why it's untraceable in some bp's

I guess 24 - 27 Keys it is