I can see your dilemma,J.J.Pehaps a good starting point,would be to share some examples and or photos of the types (fixed blade,folders, military,custom,etc. Any info on the vintage of some ot them would be helpful, too.Selling that many knives on ebay, without being a knife collector yourself, could be disastrous.You could end up selling a knife worth thousands for far,far less than it was worth.There honest knife appraisers out there, who could appraise the collection for a fee. Also, there are major auction houses who would be willing to sell them with national publicity if it was considered an important enough collection.My thoughts are,your grandfather obviously collected for a great many years. He lovingly cared for them, catalogued them, and amassed a huge collection.I would hazard a guess that there are some very valuable knives there.If you can provide us with some examples, we might be able to advise you further.