My maps indicate a small eastern movement of runaway slaves in general. There are a few exceptions where slaves have specifically intended to return home to their families, but in many cases they travel west. Additionally, the slaves owners believe their slaves are generally headed for Mexico. The Gazette shows this trend more than the Telegraph probably because the Telegraph in 1858 only has one capture ad. Have a look:
Green is where they left, yellow is where they were presumed to be going, red is where they were captured. Note, where one flag shows for Mexico it is actually about 4 that were headed there. Changing the flag slightly would make this correlation more visually stimulating.