I've spent quite a bit of time testing different brass.
When I shot a 1/2" bughole @ 200 yards with a batch of non-prepped IVI69 NATO brass that had been fired from M14s for Navy quals, and reclaimed with a SB FLS die, I stopped caring. This brass was ugly. It had grossly off-centered flash holes with gnarly burs. Brass length varied from 2.010"-2.035" (my chamber accodomated 2.045").
I'm not to the point where I'll mix headstamps for "precision" ammo, but otherwise, I'm pretty lax.
I too have dozens of ziplocks filled with brass in varying states. I have a simple system that even my lazy-ass has been able to keep up with:
1. Uninspected/random brass goes into a ziplock bag.
2. Once inspection/processing has been started, the bag gets an index card, with whatever processing I've done to it.
3. If I only get half way through before getting sidetracked, the bag of processed brass (with index card) goes into the bag containing the rest of the unprocessed stuff.
As far as keeping track of number of firings, I don't. Rifle brass goes to the range in MTM boxes, and comes home in ziplocks/MTMs. That brass is given a decent once-over for signs of ICHS or other bad shit. I generally only keep ~400-500pcs of rifle brass "in circulation" at a time, so I keep a "fired" and a "ready to load" bag for that rifle's brass under then bench. If there's only 100pcs in the "ready to load" bag but I need 250, I'll process whatevers in the "fired" bag and add it to the "ready to load" bag...thus, I lose track of firings, but I don't care. When I find a sign of ICHS, I pitch that piece. If I find a couple with ICHS, I'll paper-clip the whole batch. If I find a loose primer pocket when priming, I'll paper-clip that case, and if it's ok, I'll give the casehead a little squeeze to tighten it up.
Suppose you buy 10 tshirts, and put them in your closet. You wear 5 of them but then buy 10 more and just add them to the stack. You wear the top 5 off the stack and buy 10 more, again added to the top of the stack. Now complicate things by doing your laundry and cleaning your tshirts once a week. Obviously, the tshirts at the bottom of the stack are going to get less use than the ones on the top.
My point: Who cares? The tshirts all did their job - they kept your smelly, sweaty body off your expensive, clean dress shirts! When the tshirts get dirty, you wash them. When they get yellowed, you bleach them. When they get threadbare, you throw them away. Meanwhile, they served their purpose each time they were called upon.