Similar thing happened to me last year. Except it was with passports.
My wife and I got back late from a vacation and I left the passports in the side pockets of my cargo shorts. I took them off and left them next to the bed (where I always leave my shorts and tshirt that I had on before bed).
Well, my wife wasn't suffering the jet lag that I was and got up early. She proceeded to do the laundry since we had been gone for 2 weeks.
She didn't check the side cargo pockets and the shorts went through the wash and dryer.
Needless to say, both passports were ruined. That was a couple hundred dollar mistake because I had to get 2 new ones expidited for another upcoming trip.
Oh, and she blamed me for leaving them in the pocket, and I blamed her for washing them.
At that point it didn't matter whose fault it was; the damage was already done.