Not all wc are automatic problems. Of course they will be stressed and won't show their personalities or less obvious problems for a while. Chams in shipping stress mode are fighting pretty hard to look healthy. Once they are in a stable place for a while they start letting down their guard and THAT can be when they start to break down...they are no longer able to hide their weaknesses from the rest of the world. It could be weeks before some problems show up. Some chams do fine from day one.
Give them lots of privacy so they can rehydrate, learn their new territories, rest, bask, investigate feeders, react to changes in water chemistry and feeder nutrition, and build themselves up. If one isn't doing well, then start looking for the problem. Wait for a good fecal before treating for parasites. You'd want to get rid of what sub optimal stuff they were eating before you got them. Personally I don't believe in shotgunning without a good fecal test to see what is actually present. I used to try to get rid of anything a newly imported herp might have right off the bat. Now I don't. I would treat an obvious injury or infection of course, but I don't start laying on a bunch of medications on an already stressed animal. Some of my wc herps have never been treated for anything and have been healthy for years.