So I think it will only be a matter of time (not too much time, judging by the number of coins that you are going through) before you will find an incused.
The chase is nearly as much fun as the catch....I'd be able to get an Incused or Rotated coin off a dealer or eBay pretty easily, but that'd take a bit of fun in the 'chase' I'd love to find one 'in the wild'
I'd recommend looking for Upset Die coins Enworb. All you'd need do is concentrate on the known ones: 2010 50 cents, 2001 Dollar, 20 cents. The
50's are easy to check; I just hold at 6/12 o'clock in fingertips, and spin them from front to back - upsets will stick out like the proverbial.