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Vandalism unrelated to damage done to access and remove stolen items is very unusual in a burglary, and "tagging" is much rarer still. The reason is that they don't benefit the perp, and they take extra time inside which unnecessarily increases the risk of getting caught.

In my experience, these things are usually done by people who either have a serious personal issue with the homeowners, or by those who are known to the owners (sometimes even the owners themselves in insurance fraud cases) and who want to create what they think a stranger to stranger burglary scene looks like to throw off investigators. The giveaway is that they have only TV experience to go by, and what you see on TV is not what we see in real life. An example of this type of crime would be a "burglary" (actually an attempted insurance fraud) I investigated where every picture frame was smashed - but all the hard to replace family photos had been removed first.

Since you have a vested interest in the safety of your neighborhood, I concur with the advice to bring your information to the attention of a detective who is working on the investigation rather than passing it on to the victim. The detective knows a lot more about the case than you do, and will more than likely be quite happy with what you can contribute, especially if it turns out to be the link that can bring the case to closure.