Welcome!
Nice little "sweet meats" basket you have there, (now days known as a candy basket) HOWEVER, if you can list the dimensions...if smaller, could very well be a sugar basket reminiscent of Victorian times.
WMF stands for WURTTEMBERGISCHE METALLWARENFABRIK..
.the German company that made it.
EP stands for ELECTRO PLATE (The thin layer of silver was electronically plated to the base metal.)
NS stands for Neusilber which stands for the base metal aka Nickel Silver.
Some sites to help familiarize you with the maker of your piece.
http://www.silvercollection.it/wmf.htmlhttp://www.smpub.com/ubb/images/03/21-0449-wmfmarks.htmlAs for shining...well, that is up to you. If the item is in perfect condition (if you can surely tell) then by all means polish that up and get top dollar for it. However, majority of people do not shine it up and leave it up to the purchaser.
There is a shiny polish (which most associate with fine silver) and then there is a Butler's polish (which is a typical look for silver that has been hand polished over the years and has a more "rubbed over time" "satiny" look.