Normally VG+ conditions
Round count is basically impossible to assess, but, as said before, police turn in should be fairly low. Normally, it's holster wear and that is corrected qduring the CPO process
It's all depend on the price of new. Last summer, you could get a brand new 226 for 900-950$, making it less appealing for a CPO that sells for 800 ish...
Looks like the price of new Sig is going up, so should be worth it again
Just my 2 cents