Sale 1:

Sold for 2.5 buds pure, buds were 12 keys at the time. (3 - 0.5 = 2.5)

http://i.imgur.com/S87au4k.png

Sale 2:

Sold for a Kill-a-Watt War Pig (3.35*0.9 = 3.015) rounding to 3 buds

Before: http://backpack.tf/profiles/76561198084282202?time=1425801600

After: http://backpack.tf/profiles/76561198084282202?time=1425884400

Sale 3: (outlier)

Sold for a gifted Searing Plasma Détective Noir + 5 keys (buds were 12 keys at the time)

[2.05*0.9*~0.8] + [5/12] = ~1.89 (rounding to 1.9 buds)

Before: http://backpack.tf/profiles/76561198084282202?time=1425715200

After: http://backpack.tf/profiles/76561198084282202?time=1425801600

Conclusion:

Sales at 2.5, 3, 1.9 buds. Due to the gifted unusual and low value compared to the others, I’m calling sale 3 an outlier and taking the final range as 2.5 - 3 buds.