That sucks.
Speaking of the flaps...I think I fucked up with my recent bag purchases. I got the ones that have a seal already on them, because I remembered taping hundreds of flaps down decades ago and hating it. Furthermore, when you take the comic out (which I never do, let's be honest) there is the chance of snagging the comic with that tape on the flap. I thought, it would be so much easier to just pull a strip off and have it seal like that. Easy peasy, and it will never snag on the book because it is on the back of the bag itself, not the flap.
Well, since that seal is across the entire bag, it never seals perfectly flat, so you get some ridges, bubbles, whatever, so if the cover of another book is behind it you're going to get something a thousand times worse than the tiny indentation you are talking about from the tape, if I were to store them away for many more decades. Not that I'll likely even live that long, but still. Of course I bought 500 of the fucking things too. So now I'm gonna have to front-to-front them all, which is how you are supposed to do it, but is still annoying and I've never actually done that before.
I wish I had something old to show, but my oldest comic is X-Men #121, which isn't really all that amazing. All my shit is 80s-90s and 2000s+ Lady Death stuff.