Redownloading FeralHeart and reinstalling the Legendary Items pack has definitely helped with the missing items. The only problem is some items have gone and disappeared, such as the Barghest helm, sapphire antlers and the brown and white long antlers. And a texture for the blade and guard seems to have disappeared or is glitched on the masamune, which is quite a pity since I use that on my main character.
I fear I may have to redownload FH and reinstall the pack again and I do not want to do that.