If it really bothers you and they are expensive leather bound books or you just simply don't want anyone to touch the books; ask your agent to alert their receptionist or showing desk staff, she can place a memo to ask other agents an their clients not to touch. only look and that should solve your problem. Think it out first, after all you want people to feel at home.
Buyers open cupboards, drawers, doors, atics, etc. I had one of my own buyers open a cupboard of a piece of furniture that didn't come with the house WHILE I WAS ACCOMPANYING HIM AROUND THE HOUSE. I was with him through every room on every listing and I had an obligation to keep watching him. I had to say "That doesn't come with the house anyway, so we don't need to see inside, but check out this big walk-in closet!". As a realtor we must have ready strategy to keep buyers on track and to avoid touching personal property. You just can't trust everyone and clients are not always friends of the agents. Many are complete strangers whom the agent didn't know prior to the home search. But the very best way to avoid problems is to pack valuables away (out of the home).
Yes, I would report it to the agent; in writing. (email works fine for this). Agent should know and should send written notice to the other agent who showed the house to clue them in to the intrusion to personal property. Usually it's the buyer's agent who accompanies buyer on viewing appointments. If you know for sure which appointment this happened in you can be a little picky. If you had an open house when this happened you may want just mention your curiosity about the finding.
I don't think this would have happened if the buyer's agent was accompanying the buyer through the tour. And if the agent sat and read while the buyer looked at the house, tsk, tsk- also not a real good practice when a home is not vacant.
I hope this information helps! Best Wishes!
Often times there are "weird" things that go on at home showings. I'm sure every listing agent has tales to tell.
I previously had a vacant home listed for sale, that I typically checked on regularly for the out of state seller. Apparently ,someone, during the home showing used the facilities. The toilet was stuffed with paper, and had overflowed all over the floor, into the master bedroom. Needless to say, it was a mess!
I found it a few days later.
Had the buyer's agent contacted me asap, I would have been able to have it taken care of immediately.
I don't think you're being sensitive. I understand your feelings.