Hi Mizzzlisa,
Glad to hear it went well for you. I have the same problem eating out. The only way I beat it was doing as you suggest and getting a box right away. I will ask for a couple of small boxes and divide the meal into 3 or 4 portions, then box them for later. Found myself sometimes eating more when I got home so I started putting a 24 hour rule on my left overs. I wont eat them for a minimum of 24 hours after I first got them, I put date/time on the box with a sharpie marker and everything. Seems like a bunch of head games to me but it helps. Like they say on the beer commercial...."Its only weird if it doesn't work!!" Good Luck and congrats on your trip out.