partied until knock out

There are two report at stomp recently about young people partying so hard that they slept on the floor in the public, I'm wondering if they lose their belongings the next morning they woke up. If they didn't lose their belongings, (the recent stomp incident, the man's briefcase was in between his legs) I'm amazed. If it is in another country, i believe, your briefcase, wallet, maybe even belt, keychain will all be gone!