I am totally confused. You say you are the agent for the property .. so who is their agent? Do you mean you are the owner/listing agent for the property they are now renting? And by "their agent" you mean their buyer's agent for the property they are buying?
And is the inspection you are doing tonight the conventional "move-out" inspection for a vacating tenant?
If all the above is true, what interest/role does the buyer's agent for a different property have to play in this?
If I have misread who's who, please let me know.