The signs a tokay gecko might be wild caught are underweight and skinny animals, dark skin color, noticeable ticks or mites on the skin and sunken eyes. These animals can make a recovery and become happy and healthy geckos but will take time and proper care to do so. The alternative is to buy a captive born/bred animal from a breeder. This will rule out nearly all the problems of a WC animal but you will likely have to pay a higher price. Buying from a good breeder also gives you a valuable source of information and advice and does not encourage the capture of further wild animals for the pet trade, unfortunately CB Tokays are not as readily available as WC animals but are becoming more and more common.
Once you have bought your Tokay you should give them at least 24 hours alone in their new home without disturbance so that they can adjust to their new surroundings. Provide fresh water either by spraying or with a water dish. Many people say that geckos don’t drink from bowls but some have been known to venture down and drink from them.