I have to admit, I've seen the numbers many times...just never left my cursor over them to find this eerie message
It could be anything, he's even been know to post "Duncan Warrior" a "travel bug" from Geocaching on the Jet Gazette.
Maybe it's something else...this comes from the earliest Jet Gazette I could find dated July 29, 2002.
(One of my commentors had mentioned it before and Allen of Jet Gazette mentioned it before it clicked and thought I should post a screenshot of it...cursor does not appear though.
The clearly visible numbers appear to be 87565, just to the left appears to be his signature "Jet" in cursive with something red mixed in...another number? 2, 4, ? (Picture has hue and contrast modified to clarify things)