Found 2 traceable transactions:

Sale 1:

seller: https://backpack.tf/profiles/76561198093831749#!/compare/1656806400/1656892800

buyer: https://backpack.tf/profiles/76561198057292675#!/compare/1656374400/1656979200

for Morning Glory Ze Goggles

mini for Morning Glory Ze Goggles:

https://gladiator.tf/time-machine?item=Morning+Glory+Ze+Goggles&at=2022-07-03T21%3A33%3A00.000Z

buyers at 145, sellers at 200, suggestion at 83

average is 142 but ill take buyers so 145

Sale 2:

only found seller: https://backpack.tf/profiles/76561198119419670#!/compare/1639267200/1660608000

Purple Energy Bonk Helm, Burning Flames Ze Goggles and 5 keys for Roboactive Soldier's Slope Scopers

51 + x + 5 = 150

x = 150 - 51 - 5 = 94

mini for Roboactive Soldier's Slope Scopers:

gladiator doesnt have data from that time

suggestion at 150

mini for Purple Energy Bonk Helm:

gladiator doesnt have data from that time

suggestion at 51

Sales: 94, 145

I take range 94-145