I closed the last one so the recent buyer could suggest but he's asked me to just resuggest with his additional info it instead.

Sale 1

Sold for a death at dusk tipped lid (330), molten mallard tipped lid (110-130), molten mallard pencil pusher (80), scorching pyro's beanie (44-52), molten mallard brainiac (43-51), stare from beyond el jef (153) 3 buds (5-6) and 8 keys = ((330 + 120 + 80 + 48 + 47 + 153) * 0.9) + 24.5 = 725 keys

Seller before: http://backpack.tf/profiles/76561197997855531?time=1427612400 (March 29th)

Seller after: http://backpack.tf/profiles/76561197997855531?time=1427698800 (March 30th)

Sale 2

http://www.tf2outpost.com/trade/25528958

Sold for frostbite boxcar bomber (240-264), cloudy moon wraith wrap (400), mallard spartan (60-84), bubbling pyromancer's (34-36), blizzardy crocleather slouch (13-17) and $600 paypal (308-323) = ((252 + 400 + 72 + 35 + 15) * 0.9) + 315.5 = 1012 keys

Seller before: http://backpack.tf/profiles/76561197995232897?time=1430290800 (April 29th)

Seller after: http://backpack.tf/profiles/76561197995232897?time=1430463600 (May 1st)

Pyromancer's and crocleather are a bit outdated but they're fairly small parts of the trade so don't think it really makes much difference here.

Mini on mallard tipped lid:

http://backpack.tf/vote/id/554d29dbb88d88b6128b4568

Mini for mallard pencil pusher:

The above sale is the only recent one. Using current BO as it's the only price I have = 80 keys

http://i.imgur.com/vxmngj2.jpg

Mini for mallard brainiac:

Sold on scm. Tradeable on 12th, so bought on 5th.

http://i.imgur.com/AHqnLcX.jpg

One sold on scm on 5th

http://i.imgur.com/U6lwGfq.jpg

Buyer paid $124.99

Seller received $106.24

Scm key price ~$2.45

124.99/2.45 = 51 keys

106.24/2.45 = 43 keys

Range = 43-51 keys

Mini on stare from beyond el jefe:

Zero recent sales I can find.

http://www.tf2outpost.com/trade/25624823

Seller BO 200 keys but states in comments "knifestorm price" = 153 keys

Paypal to keys:

http://prntscr.com/71sj27 - ty peterzee77 for screenshot

Buyer pays $630

Seller receives $600

Key price ~$1.95

630/1.95 = 323 keys

600/1.95 = 308 keys

Range = 308-323 keys

Large range but it is what it is. Rounding to 730-1000. Feedback and thoughts are welcome.