Last long run, in the wrong shoes

RUN: 12.5 miles in 2hrs. One last "long" run. Then tomorrow a 10K, then a steep taper. I was getting ready to head out when I grabbed my shoes and checked for dirt in the soles before putting them on. I noticed just how ragged they are, another reminder to buy the new shoes I've needed since February. I also noticed that they were the Brooks 7.5!! I'm supposed to be running in my Brooks 8's! When did I change?? The only way I can change is to swap the insoles, so it's not a random bad grab in the closet. Apparently, they aren't bothering me. The 8's replaced the slightly too small 7.5's. (Let's ignore the fact that the 7.5's have been in semi-retirement since last March--why are they still in the closet!?) Put 'em on, went out the door. Today was a tour of old houses: LFP, BP, then TGP. I looked at doors and paint as research for our house. So I saw a lot of new areas and since it wasn't an out-n-back I didn't mind meandering. I was a little sluggish, but enjoying it. At many points I wondered just how long I'd been running in the 7.5's. How messed up was my shoe's mileage log? A few lewd a-holes with comments to me, but otherwise a normal run. I expect that sh!t in the City. Around mile 7.5 in TGP I noticed not for the first time that my shoes were loose. It's the socks, I think, I'm wearing thin socks. No, I wear these socks all the time. This was frustrating! Wrong shoes, loose laces,....where is the well-oiled, honed, kinks-worked-out system I've had? WTH?? So I stop to pull the laces, at which point I realize... ...I'm not wearing my Brooks. I'm wearing a pair of old Sauc's! (75% of my running shoes are white with blue and gray, hard to distinguish if I'm not paying attention). So old, in fact, they aren't even on my shoe mileage log anymore! These are retired shoes I wear to work!?!?!?!? I'm doing a long run in these!?!?!? WHAT?!?!?! My feet were feeling good up to this point. But about 0.5 miles after they realized what was happening, they started to complain a little. Haha, I'm sure that was all in my head. But this was a surprise--so much for new shoes with cushy support and fresh poly foam. Or were my feet so acclimated to all this running that they can handle a little beating?