Just do what makes you happy with your collection, then disclose if you decide to part with them. If I were to restore a symbol, I'd take a sample of paint from it and make a very deliberate-looking mark (such as a heart, mini-symbol, my initials, or "RP" for repaint) under a hoof to mark her as repainted. That way if she leaves your hands without your input, she's got evidence of restoration.