There is no need to drip acclimate corals. You can temp acclimate then place them in. If its a trusted source you purchased from you can chance putting them in your DT right away. I like to do a FW dip on mine, and them hold them in my QT for a week.
In any case depending on the coral your water would be tainted a brownish color if they were damaged. Fleshy substance maybe comming off them too. They will prob all be closed and stay that way for a day to 3 days after placing them in your tank. At the acclimation process its really difficult to tell if somthing is wrong or they are just closed up and stressed a bit. Only definate sign would be a horrible odor when you take them out. And basically they would be like slime and look nothing like they should. Hope this helps.