I don't see how this sold for a pro ks scatter... also, I think you meant pro aussie scatter..

seller for 50 for a week http://www.tf2outpost.com/trade/27991587 prolly needs a range

A few other sales have happened

bulk

http://backpack.tf/profiles/76561198043936328/#!/compare/1459468800/1459555200

Sold for max + 2 keys ~32

http://backpack.tf/profiles/76561198105613949/#!/compare/1456992000/1457078400

http://backpack.tf/profiles/76561198043936328/#!/compare/1456992000/1457078400

The pro ks scatter is probably a bit high at 52 (sellers are ~48 ish).

That makes the sales here 32-48. There's a seller here for 48: http://www.tf2outpost.com/trade/28030603

You can either resuggest at 32-48 or wait for the 48 to sell. If it sells fast, then 48 flat may be better