Although the topper is over a year old, less than half are priced...

Sale 1:

http://www.tf2outpost.com/trade/25306249 http://backpack.tf/profiles/76561198155071664?time=1425801600 to http://backpack.tf/profiles/76561198155071664?time=1425884400 Sold for a bud and 9 keys pure, equivalent to ~1.75/1.8 buds/21 keys (Buds were 12 keys at the time), but capped by it's B/O at 20 keys/~1.7 buds.

Final sale value: 1.7 buds

Sale 2:

http://www.tf2outpost.com/trade/24237561 http://backpack.tf/profiles/76561197995970892?time=1424073600 to http://backpack.tf/profiles/76561197995970892?time=1424160000 Sold for a C9 Snaggle, open suggestion at 1.85 buds (http://backpack.tf/vote/id/54fbeba2b98d8843708b5176) , 1.7 buds after overpay.

Final sale value: 1.7 buds

1 of 1, and not current selling anywhere. With two sales at 1.7 buds each, 1.7 buds should be alright.