Left board in a hot car - ALL DAY

Hey fellas - bit of a horror scenario. Took my still fairly new EPS board to the beach in the back of the car, in a board bag (with reflective side up)), no waves so didn't surf. Came home and somehow forgot about my board in the back (had a lot on my mind).
Next day the car sits in the sun all day - in Mexico. Windows up. Not insanely hot this time of year, but still hot. Windows are tinted (its a Prius - yes...yes I'm a dick).
I farted round home all day, and headed out at 4.30pm - get in the car and see my board there, unmoved. fleshin' xxxxx. Car is hot as hell. I hurry the board inside, take it out of the board bag and its cooking. Wax melting and that (but the underside was face up).
I inspect it and it definitely feels softer. I think its fleshin' toast. But can't see any major bubbles. After it cooled down it seems back to normal. I de-waxed it to check more closely. Still no obvious delams, just the same pressure dents from before.
I was sure I was in for a total delam nightmare due to all the factors mentioned above: heat + time + lack of air moving around + an EPS board. Can anyone tell me - how is it that this didn't happen. Would a delam always be immediately apparent or do they sometimes take a while to come up? (Its been a few hours now and still nothing coming unstuck). I was 100% sure this thing was toast.
Cheers
Next day the car sits in the sun all day - in Mexico. Windows up. Not insanely hot this time of year, but still hot. Windows are tinted (its a Prius - yes...yes I'm a dick).
I farted round home all day, and headed out at 4.30pm - get in the car and see my board there, unmoved. fleshin' xxxxx. Car is hot as hell. I hurry the board inside, take it out of the board bag and its cooking. Wax melting and that (but the underside was face up).
I inspect it and it definitely feels softer. I think its fleshin' toast. But can't see any major bubbles. After it cooled down it seems back to normal. I de-waxed it to check more closely. Still no obvious delams, just the same pressure dents from before.
I was sure I was in for a total delam nightmare due to all the factors mentioned above: heat + time + lack of air moving around + an EPS board. Can anyone tell me - how is it that this didn't happen. Would a delam always be immediately apparent or do they sometimes take a while to come up? (Its been a few hours now and still nothing coming unstuck). I was 100% sure this thing was toast.
Cheers