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Look, we are anonymous and nude simply because we enjoy it. What's so wrong about that? You act as if user names are some kind of big deal.
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I know a thing or two about dumpster diving nude, Dude, and I can tell you this Bertha person doesn't know diddly squat about it. You'd have to hire a licensed crane operator to lift and swing her into the dumpster, and I seriously doubt there are dumpsters with large enough openings to accomodate her size. She'd be more likely to fit into one of those large construction boxes they use to collect scrap building materials when they're tearing down a structure or replacing the roof.

The trick is to get to the food before it's actually thrown into the dumpster, which is where a good quality shopping cart comes in handy, but it has to have good rubber on the ground and swivel tires that actually work. And it helps if you know someone who works at the eating establishment where the dumpster is parked, and the nicer places don't even use dumpsters.

Then what? Well, you get yourself one of those heated delivery bags like the pizza delivery people use that's what. Oh, and you become friends with a taxi driver so you can pull up to the back door in the nude and have your leftovers brought right to the car. Then you grab the food and drive off.