Hi there.  Do you have a scanner with your computer?  If so you can make quite acceptable pics using this. Broadly speaking, any visible wear, knocks or scratches will reduce the grade.  Compare them with the new 5p coins that have just started circulating.  If they are about the same you may be able to claim UNC but even movement around a box can reduce this to EF quite quickly I'm afraid. You don't say if this is an 'offical' boxed set (ie in a custom made case) or not.  Nor what denominations you have.  If you have all seven coins from Crown to Threepence in a made to measure case it could be a proof set. You may find your household insurance covers such a collection, but whether to lock them away or not depends on what you want to do with them.  Handling, however careful, will eventually reduce their value.