RR, here are the letters.
". . . and we would assure you of our perfect confidence in you as the servant whom God has chosen to give the 'meat in due season to the household.' Sincerely, your sisiter in Christ, C.M.E., Ohio" (WT, 15 May 1906, p. 150).
"I have the fullest confidence in you as that servant whom the Lord has so highly honoured as to place him as steward over the truths now due the 'household of faith'. With kindest regards and Christian love, your brother in Christ, J.T.J., Virgina" (Ibid).
"I think of you as that faithful steward whom the Master made ruler over all his household to give meat in due season. . . . Yours in Christ, our Redeemer, (Mrs) S.K. Story, Arkansas" (WT, 15 February 1908, p. 63).
"Beloved Brother, it has been our thought this year to send you some slight token of the great love we have for you as God's appointed servant and channel for dispensing the 'Meat in due season' to the Household of Faith.... Your loving sisters, by his grace. North Island, New Zealand" (WT, 15 November 1915, p. 351).
The last letter is especially interesting when compared with what Russell wrote in an earlier watchtower.
". . . that at the time of the parable's fullfillment the Lord would appoint a servant in the household to bring these matters to the attention of all the servants. . . ." (WTR, 15 April 1904, p. 125).