I'd be mad and upset too. I lost my phone a few months ago after I thought I dropped it on a ride. It turned out I dropped it at home and I eventually found it, but it really threw me through a loop as my life is on my phone. I now carry a cheap simple phone on the bike for emergencies.
I've thought about investing in a front mounted bag to put things like keys or phone in.
It's not really losing the stuff I would worry about. If a scumbag finds your keys and ID, then can they work out where you live. Do you then have to change your home locks and quickly cancel the cards so someone doesn't try to use them and if they manage to get into your phone, then what do they get to there. Suddenly you have to change all your account passwords for all the things it might be logged into.
Monetary is secondary. It's what else they can find out. Not fun.