Ugh, yes, a hundred times yes. My shop did the exact same thing with brake pads last spring. We just winged it for weeks and then suddenly we're tearing apart the storage room looking for a set that wasn't there. It wasted like two hours of my day and the customer was just standing there annoyed. It's so easy to let it slide when you're busy, but that's when it hurts you the most. I mean, a cheap clipboard and a quick count fixes everything, it's not rocket science. Your post is so true.