In relation to anything of a "metal" nature, I have been using a magnet to try to work out what's of any value.    Do the experts here also use acid testing kits?  I would be worried I would damage something.......

I've also heard you can stick something under a grinder, which I don't even think we have a grinder in our shed.  

What is your basic method for determining what is silver/pewter/etc??   I would hate to give something away which turned out to be of real value.

Also.....  If you find something old, eg vase, candle holder, etc and can't find it anywhere on eBay, does that automatically mean it's not worth anything?   Haven't had time to go checking out antique stores for opinions on these things.

Hope you don't mind the basic questions.  Still got contents from two storage units, although we are slowly making some money selling things!   Hopefully will move onto storage unit no.3 next month!