as said an ebay search for star silver paint will come up with the exact ones because "star silver' is quite a rare term. obviously 'sunrise red' or 'sea blue' would not worK and not be a good idea. Try it.
If you type in the exact code to ebay of course you will get only the right ones but to be honest 'star silver' will not return many irrelevant ones and they will be obvious.
Surely thats the objective of the exercise - to get the correct match and not to have to outsort incorrect ones

depends how anal one is. searching for star silver paint is perfectly adequate in this case, try it.
Dbdb , to give you an opinion some time ago, for a friend we bought a corect code repair paint (which they use) for a silver color honda from the service.. and the color was 5-6 shades darker than the original.. we applied on a test card and result was unacceptable by all standards.. never trust a paint code alone.. metallic colors are so sensitive that even it changes with spraying technique and number of layers easily..
I've had two lots of star silver from 2 different ebay suppliers, both very good. Some colours don't fade much star silver seems to be one. Black is almost never a problem. Any red colour will fade and any white can be a pain to match. The two suppliers I used on ebay are fiona_mcgowan123 and wilson lendrum & weir ltd. Note these are touch up supplies only, I haven't been spraying. Any spray needs to be complete panel IMHO. Sounds like you may have had the wrong paint or maybe the honds silver does fade. Incidentaly I bought ruby red honda from wilson lendrum & weir ltd and I thought it was a pretty good match considering it was red and the car 12 years old.
all colors fade, its only a matter of time.. in UK you may need say 10 years (or more) but here 4-5 years more than enough..
star silver is the most hard color to give exact match.. number of paint layers, quality of gun, experience of painter, laquer quality (and number of layers) will make a different shade easily..
as for complete panel spray, if you want perfect job you need to blend also to adjacent panels .. but if area you paint is small you can blend also in the same panel..
the touch up paint was from honda , same color code and as I said it was awful..
and imo red color is worst of all colors that fades horribly..