Seller in the classifieds at 15 keys to keep an eye on. 17 keys may prove high then.

More sales:

Sold for $32.86 and $43 in Marketplace(~16 Keys and ~21 Keys using 2.05 value)(21 is an outlier)

https://marketplace.tf/items/30800;5;u107

Sold for 15 Keys

http://backpack.tf/profiles/76561197963500354#!/compare/1486425600/1486512000

Sold for 16 Keys

http://backpack.tf/profiles/76561198119563409#!/compare/1487376000/1487462400

http://backpack.tf/item/5215834650

Sold for 15 Keys

http://backpack.tf/profiles/76561197964171516#!/compare/1493942400/1494028800

Sold for 14 Keys

http://backpack.tf/profiles/76561198071167440#!/compare/1487980800/1488067200

http://backpack.tf/item/5215270795

Sold for 13 Keys

http://backpack.tf/profiles/76561198247218246#!/compare/1491868800/1491955200

Sold for 17 Keys(1 Key was in metal)

http://backpack.tf/profiles/76561198117433241#!/compare/1487808000/1487894400

Sold for a Bubbling Respectless Rubber Glove(10.5 Keys) and ~2.5 Keys in Sweets(13 Keys total)

http://backpack.tf/profiles/76561198259820488#!/compare/1490486400/1490572800

Sold for 17 Keys

http://backpack.tf/profiles/76561198059628402#!/compare/1486598400/1486771200

Sold for 17 Keys

http://backpack.tf/profiles/76561198122499059#!/compare/1487116800/1487203200

Sold for 13 Keys

http://backpack.tf/profiles/76561198144346135#!/compare/1490140800/1490313600

Sold for 15 Keys

http://backpack.tf/profiles/76561198255024131#!/compare/1486598400/1486684800

Sold for 16 Keys

http://backpack.tf/profiles/76561198002186909#!/compare/1487116800/1487203200

Sold for a Stormy Storm German Gonzila(14 Keys)

http://backpack.tf/profiles/76561198068782807#!/compare/1487548800/1487635200

Sold for 12 Keys and ~1 Key in Sweets(13 Keys total)

http://backpack.tf/profiles/76561198097283109#!/compare/1487462400/1487548800

Sold for 17 Keys

http://backpack.tf/profiles/76561198312480435#!/compare/1488067200/1488240000

Sold for 14 Keys(1 Key was in metal)

http://backpack.tf/profiles/76561198191015258#!/compare/1488240000/1488326400

This should be fine.