Noticed my Mondo card was missing. Went back to the Big Yellow storage in Battersea 48 hours later after trying everywhere else I’d been.
After confirming with the receptionist that it hadn’t been handed in I strolled backed to the car and found this:
I’d personally driven over it several times (and I’m sure a few dozen more had as well) and it had dealt with intense sun (it’s a few shades lighter now) and rain. I only noticed it because of it’s crazy colour.
Still works fine ;)… +1 for card manufacturer choice.