As promised I am back to share my Hasp brass closure rehab project.
I received the bag and I went

the brass was green all over, a bit more and it could be a Leprechaun bag, but I thought it would be worth to try. I will share the steps I took with pictures. So this might be long...
The way the brass looked when I got the bag
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All my research mentioned to clean first with hot water and a mild detergent. So no problem because I was going to dunk the whole bag. I used Dawn as usual.
After a few minutes I came back and was surprised to see that the green stuff was dissolving/peeling by itself. I used a soft brush and finished taking it all out. I also used a toothpick (several), to scrape around the edges, underneath, etc..
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I rinsed, stuffed the bag, and let it dry as usual. After a day I went back to the brass that looked like this, no green but still very worn looking.
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So now I used something I found "interesting" as recommended by people on a site, to clean brass from rifle slings. It was WD40.
I gave it a try, no hard rubbing, just a bit on a soft cloth and go all over, the improvement was effortless. Afterwards looked like this (the lighting made it look silver, but still was golden)
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Much, much better, but still I was not happy with it, so I used my "go to metal polish" that I have to thank to whoever here recommended it, and I have been using since then, the best ever for me... Mother's.
So now I rubbed as I normally do, and oh my! All the black that came out, was unreal. And after I was done (may be I could rub even more), the end result was all worth it! Only surface scratches left.
Judge by yourselves. (the green still seen is a reflection of the top I am wearing, LOL)
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Oh and I still I am not sure (I am not expert, LOL), if all the metal is real brass or brass plated, but there is engraving on it.....
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Bottom line, it was actually effortless and totally worth trying. My kudos to Coach again for making such superb quality products. And my thanks to you for your tips all along.