[url]http://backpack.tf/vote/id/52006a5bba25364a48000020[/url]

Here's my initial evidence. I'm making a slight modification (increase in the higher value by 0.1) because of another sale that I've found.

[url]http://www.tf2outpost.com/trade/10733892[/url] went for three buds and eight keys (a bit between 3.3 and 3.4).

There's also this interesting one. [url]http://www.tf2outpost.com/trade/11598934[/url] "Peace Dixie + Orbitng Fire Yellow Belt + Planets Dapper + Keys" = 12 keys + about 21 keys ([url]http://www.tf2outpost.com/trade/13329800[/url] but this hat needs to be updated) + about another bud + "keys" = about 2.5 + "keys" so that one's a bit too unspecific.