is there any way to get the Ap-Sap naturally (doing something in another game, being somewhere at a certain time), or is it just an unbox/crafting thing?
Latter, but you can't craft a unique one.
Oh hey, you could probably profit in money with salvaged crates.
People always overprice crates 30 and 50, so what if you do this:
1. Buy 2 #40's off the Market
2. Trade both for a 50
3. Sell 50 for slightly less than usual but more than twice a 40
4. Buy 3 40's [Market]
5. Sell them for 30
6. Sell 30 for slightly less
7. Buy 4-5 crate 40's
8. ???
9. Profit
This won't only benefit you, but if you make lower and lower crate prices, other people will be happy.