Being offered:

http://www.tf2outpost.com/trade/8401318 b/o: 32 keys

Bubbling Otolaryngologist's Mirror (20-26 keys)

Steaming German Gonzila (17-21 keys) + keys + sweets

http://www.tf2outpost.com/trade/8180381

Massed Flies Magnificent Mongolian + team spirit bills (12-14 keys + 9 keys)

http://www.tf2outpost.com/trade/8594490 b/o: 20 keys

19 keys - accepted

Conclusion: Considering overpaying with unusuals in a few trades, low range of 17 keys should be legit due to the lowest notable offers being around that range. Higher range is due to one trade accepting 19 keys and one or two offers being around that range.