It is good to want to be a good neighbor but don't jump in the deep end & end up well over your head. Ga. Real Estate law demands that both the seller & the sellers' agent/broker disclose what is considered any material defect - something mold would certainly qualify as. In addition, todays' buyers almost always have a home inspection done which should turn up any problems. Where you could get in trouble is if you tell someone there is a problem & it doesn't exist, or has been disclosed properly, or has been fixed with the repair having been disclosed. Should information you provide be proven inaccurate, you could be on the hook for a failed sale. If you happen to know a prospective buyer you might consider asking them if they have seen a disclosure yet &/or recommending they get a home inspection. Anything more aggressive than that could come back to bite you later.