Sold:

http://imgur.com/a/RfDep

http://backpack.tf/profiles/76561198065110530#!/compare/1495497600/1495584000

http://backpack.tf/profiles/76561198315497328#!/compare/1495497600/1495584000 - sold for 27 keys

Credits to Moose

http://backpack.tf/profiles/76561198061931686#!/compare/1492214400/1493424000 - sold for 24 keys

http://www.tf2outpost.com/trade/28894708

http://backpack.tf/profiles/76561198053700606#!/compare/1493078400/1493164800 - sold for Starstorm Insomnia Universal Translator (33) + sweets (1) = 30 keys b/o

http://backpack.tf/profiles/76561198053700606#!/compare/1492905600/1492992000 - sold for 23 keys (quicksold)

http://www.tf2outpost.com/trade/28890952

http://backpack.tf/profiles/76561198117542709#!/compare/1492905600/1492992000 - sold for 24 keys + sweets (1) = 25 keys (quicksold)

http://backpack.tf/profiles/76561198206460868#!/compare/1491696000/1492905600 - bulk

http://backpack.tf/profiles/76561198315497328#!/compare/1495584000/1495670400 - sold with sweets (1) for Circling Peace Sign Le Party Phantom (29) = 28 keys

http://backpack.tf/profiles/76561197984425593#!/compare/1495324800/1495411200 - bulk

Conclusion:

sales at 23 (quicksold), 24, 25 (quicksold), 27, 28, 30

taking 27-30 keys