You can now search Steam market for a crate number

http://steamcommunity.com/market/listings/440/Mann%20Co.%20Supply%20Crate?filter=%2339

I counted over 800 at 2 cents. it will take weeks to deplete a supply like this. This is a recent crate, there are probably thousands up at 2 cents each. Someone feel free to count them all. Im stopping at 800.

If you value keys at 3.66 each and sell them for atleast $1.98 that come out to around $.06 cents per scrap