Just because there are gas logs in the fireplace doesn’t mean that the new buyer will retain them. Inspect it as a normal masonary fireplace.
Regarding the logs themselves, I usually say, “According to today’s standards, manufactured fireplace clearances are determined by the manufacturer. The buyer should consult the manufacturer’s manual or otherwise contact the manufacture to determine if the clearances are adequate. Gas cutoffs are acceptable inside a gas fireplace firebox, if the manufacturer approves it. Consult the manufacturer’s operator’s manual prior to operation of gas logs.”
I often add, “Consistent with our inspection agreement, the gas logs were not tested. You should have the homeowner/builder demonstrate the operation of the gas logs and transfer any operating manuals to you.”