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all (2) classified sellers at 5 keys: http://backpack.tf/classifieds?item=Battalion%27s%20Backup&quality=14&tradable=1&craftable=1&australium=-1
and only 1 outpost trade which doesn't specify price: http://www.tf2outpost.com/trade/28558251
screenshots of classies and histories of items needed.
https://gyazo.com/0927dde732112b6612b8553adad7f9d0
http://backpack.tf/item/4324926852
http://backpack.tf/item/3383691688
Theres the screenshot and histories you need.
Sorry, was my first suggestion
no excuse not to read the rules/guidelines