Locke's proposed Life of Lord Shaftesbury

I perceive that the interesting volume of letters of Locke, Algernon Sidney, and Lord Shaftesbury, published some years ago, by Mr. Foster, is advertised in your columns by your own publisher; and I therefore inquire, with some hope of eliciting information, whether the papers in Mr. Foster's possession, which he has abstained from publishing, contain any notices of the first Earl of Shaftesbury; and I am particularly anxious to know whether they contain any references to the Life of Lord Shaftesbury which Locke meditated, or throw any light upon the mode in which Locke would have become posse…