Hi JayPray,
I can understand your fear, as I had a similar situation on New Years Eve. It is scary when we black out, and I think our minds automatically go into panic mode. I would create all kinds of scenarios in my mind of what happened, most of which weren't true. I have definitely had false memories (or maybe just assumptions), and it is hard to move on until we figure it out!
Keep in mind that this was a "drinking fest", and your boss clearly promoted the event. So, at least you have an excuse for the consumption. When it happened to me, I simply went to work and said, "Wow, I'm not used to drinking like that, what a crazy night, I'm not doing that again!" (all lies, of coarse) This gave me the opportunity to admit that I had drank too much, and put it behind me.
Now, I am 30 days sober and never have to worry about this happening again. I hope you join me on this wonderful journey!
Cell phones can be replaced, it is harder to replace your dignity.
Be well, and take good care