As far as resale value I will also have to agree that the more time that goes by the less it will be an issue to potential buyers. If you do follow through with buying the house make sure you keep everything you used to determine the problem was solved so that you can show the same info when you decide to sell the property.
Yes, you should have a professional Mold Inspector do the job for you, not just your home inspector. Their knowledge and expertise only goes so far, and I think they would rather you have your inspection done by someone specifically trained to detect mold and moisture issues.
I agree with my colleague that, if the problem has been properly addressed and if you make sure to maintain the house while you live in it so the problem doesn't recur, your buyers, when you're ready to sell, will be less concerned with a moisture/mold problem that occurred years before and has been successfully abated.
The repaid does sound sufficient but only you and your inspector will be able to determine if the description was successful in stoping the water problems.
Ask your agent to revise (if they haven't done so already) the MAR inspection contingency form to allow you to provide intrusive testing. In won't be cheap but you will then need to find a company that can selectively open up the walls (and make the subsequent repairs) to check to see if the mold is gone. Opening the walls is the only way you will know for sure.
It will affect your resale to the same extent that it is concerning you while you are purchasing the home. As time passes the thought is that many buyer concerns will mitigated (we had water 30 years ago is different to a buyer than we had water last year) but it will be something that you must disclose when you sell the house.
The transferable warranty is a reassurance as well. What caused the problem? Was there a broken pipe that caused the mold to grow? What was the extent of the problem and how was the problem resolved? The answer to those questions will determine whether this is a typical repair issue or a red herring problem that could always cloud the resale of the home.
For example, if the drywall was damaged, it should have been replaced unless the mold was very minimal and superficial. Mold loves to eat drywall. Was there water intrusion between the walls? Has this been successfully treated as well? As the owner of any home, you will want to be sure that you manage the moisture level in the home and quickly treat any beginnings of mold on the shower tiles, for example. Maintenance is essential to prevent