Civet has smelled a couple of different ways to me. Initially, I get a bit of "baby vomit" but sometimes, it is slightly fecal. It always settles down and adds incredibe sensuality to a scent for me. I understand that is smells "off" to many because of indoles. Certain types of Jasmine contain similar indoles and they also smell fecal to me initially. Someone please correct me if I am wrong with the above.
Civet is very prominent at the beginning of Jicky. This is evident more so in the PdT version than the EdT for me. I have not tried the extrait so I can't comment on that. Jicky's little brother Mouchoir de Monsieur also has a blast of civet at the beginning but the newer version is tamer that the old one. Ungaro II is another civet heavy scent that mixes nicely with citrus. Here the base is laden with the civet. It is probably that Jicky and MdM have this in the base as well but for some reason, I get the blast initially and it settles down nicely. I understand that a few of Amouage fragrances have civet and I get lots of it in both Silver Cologne and Dia. Very, very sensual to me. I have read rumor that Amouage still uses real civet which has been outlawed because of supposed cruelty issues. Again, please correct me if I am wrong. The Amouage scents do smell out of this world to me and on a different level so I would not be surprised if the civet is real as opposed to the synthetic used elsewhere.
I can't comment on the muget issue but I thought muget was lily of the valley which to me doesn't resemble civet. I am basing my impression of lily of the valley on Geo. F. Trumper's Skye which it mid heavy with lotv and ylang ylang to me so I may be off right there...
Give Jicky and Ungaro II a try. I am sure there are many, many other uses of civet to try. Check the Basenotes directory and run a search on the note and all of the fragrances with civet should come up.
Lastly and most importantly, welcome to Basenotes!