The way to tell the silver plate is to look on the back for stamps or markings. You may need a magnifier. Chinsy silverplate may be magnetic. Silver over iron. Non-magnatic silverplate often has letters on the back and if it you see, P, EP, PC, or POC, you know it's silver plated over something else.
P - plate
EP - electroplate
PC or POC - plated coppr or plate on copper.
Take any of it. I've sold lots of silverplate on the bay. Polished it, and they were decent usable pieces. Didn't make loads, but got it out of here at a profit and made more that scrap value.
If you're lucky, you'll find solid silver. It will have nicer marks stamped, or better makers listed. G00gle British silver marks for examples. You SCORE if you see the word STERLING. That's the real thing, as well as ".925" that is often stamped on silver jewelry, but I'm not sure about dishes. Sterling and .925 is always a good find.
Good luck at the bag sale. Go for anything silver, copper and brass, then things with motors before the generic electronics. Stuff that bag! Might need a wagon or stroller so you can lift the thing. Contractor size? Good grief! Bargain. Easier to sell metal than a bag full of used clothes.
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