Take a look at this part of a timeline:
July 6 2001: Condit finally admits affair to police.
July 10 2001: Condit and Mike Dayton dump the watchbox.
July 11 2001: Condit's apartment is searched by police.
July 16 2001: Police BEGIN their search of Rock Creek Park and Klingle Mansion.
August 1 2001: The search of Rock Creek Park is suspended for a few days when two false tips come in almost simultaneously(the keymaker and from a military base).
August 2 2001:Condit goes back to California and pretty much hides for the next month.
I always thought that the trip to dump the watch was a two-fold trip. Supposing Gary had advance knowledge of the Rock Creek Park search, did Condit and Mike throw out the watchbox AND and go to the park to make sure she was still well covered. (The old return to the scene of the crime thing).
Plug in "Where in the world is Chandra Levy?" for the timeline. It's not perfect but flows well with a lot of information and a very good map. (I disagree with Gary being at his office from 1-5 on May 1st.)
Sac
Sunday, 4-29-01 .. Chandra was "seen" on a survelliance video at a SevenEleven in Arlington, Va.
Sunday, 4-29-01 .. According to the timeline given by Condit, he had brunch with the Mrs., then shopping in the neighborhood with the wife; at noon they go to his office; from the office by subway to an Italian grocery, then home to cook dinner.
It is known that Condit has a car, used by his staff. If Chandra were in Arlington on 4-29 .. whose car?
If Condit and wife go to his office, by what means? The suggestion is that throughout the day, Condit is car-less ... possibly "staff" is with Chandra and setting things in motion?
The rest of Condit's timeline prominently features his being picked up at specific times by staff .. 4-29-01 seems to be the exception.
Source: Condit's Calendar posted by FReeper JohnHuang2 6-28-01