If you say what you saw was a ghost, then that's fine by me, if it's dressed in top hat and tails, great, but (for me) I believe that the soul/spirit survives the body but cannot be seen, it can be felt, it can touch things because it possesses energy, but seen?
Not for me, if it's natural for the soul to survive the body then it is entirely impossible, illogical and irrational to suggest that inanimate objects can survive the owner's death too.
In matters such as this, you only ever need to prove things to your own satisfaction.