Please please please read the stickies in for sale forums.
There is no way to give 100% assurance as to what you think is "excellent condition" and someone else thinks is "excellent condition" since it may differ.
Yea, welcome to reality. The classifieds here are "at your own risk". The responsibility to resolve issues is strictly on the folks who conduct the transaction(buyer/seller), this site bears no responsibility for the transactions or any issues therein.