Did Lincoln pick up Maj. Rathbone amd Miss Harris?

[RJNorton]

I tried to find the earliest author to report Laura Keene's presence in the State Box. I found an 1865 account by Gath in "The life, crime, & capture of John Wilkes Booth."

"Miss Laura Keene, the actress, proved herself in this awful time as equal to sustain a part in real tragedy as to interpret that of the stage. Pausing one moment before the footlights to entreat the audience to be calm, she ascended the stairs in the rear of Mr. Lincoln's box, entered it, took the dying President's head in her lap, bathed it with the water she had brought, and endeavoured to force some of the liquid through the insensible lips."

I have not been able to find any contemporaneous eyewitness accounts that Keene was in the box; if that be true, how can Townsend's 1865 account be explained?