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http://backpack.tf/classifieds/search/id/52d1cab84cd7b80a188b4568 - 7 below 2.5
http://www.tf2outpost.com/trade/17429894 - 2.3
http://www.tf2outpost.com/trade/17482948 - 2
http://www.tf2outpost.com/trade/17447527 - 2.15
http://www.tf2outpost.com/trade/17452539 - 2
http://www.tf2outpost.com/trade/17488530 - 2.4
http://www.tf2outpost.com/trade/17359032 - 2.4
http://www.tf2outpost.com/trade/17475319 - 2.4
http://www.tf2outpost.com/trade/17462831 - 2.4
http://www.tf2outpost.com/trade/17458710 - 2.4
http://www.tf2outpost.com/trade/17429987 - 2.4
http://www.tf2outpost.com/trade/17326470 - 2
http://www.tf2outpost.com/trade/17484915 - 2.3
http://www.tf2outpost.com/trade/17451324 - 2.4
http://www.tf2outpost.com/trade/17388495 - 2.4
http://www.tf2outpost.com/trade/17480946 - 2.5
http://www.tf2outpost.com/trade/17479619 - 2
http://www.tf2outpost.com/trade/17475415 - 2.4
http://www.tf2outpost.com/trade/17468811 - 2.4
http://www.tf2outpost.com/trade/17388428 - 2.4
http://www.tf2outpost.com/trade/17457253 - 2.3
http://www.tf2outpost.com/trade/17451932 - 2
http://www.tf2outpost.com/trade/17455592 - 2.3
http://www.tf2outpost.com/trade/17433706 - 2.15
http://www.tf2outpost.com/trade/17429377 - 2
http://www.tf2outpost.com/trade/17429278 - 2.4
http://www.tf2outpost.com/trade/17400363 - 2.2
http://www.tf2outpost.com/trade/17380492 - 2
http://www.tf2outpost.com/trade/17372419 - 1
http://www.tf2outpost.com/trade/17301987 - 2.4
http://www.tf2outpost.com/trade/17422767 - 2.4
2 keys and 3 ref is not 2.5 keys, it's 2.4. So your only proof for your upper limit is wrong.
Also, you have classed 2 keys and 2ref as 2.4, but it is actually more like 2.3 keys.
Your proof could do with re-labelling accordingly, and the range might need 2.5 removing in my opinion.