Q:

How much looting has actually occurred during the recent protests in the US?

In recent weeks, the US was rocked by waves of massive protests, following the police killing of George Floyd, and later additional citizens (but of course fueled by and concerned with much more than that).
In some of these protests - or perhaps while they were occurring - there has been reporting of looting. Here's an example article (I don't know the website, just web-searched and found it) showing a picture of a damaged cashier lines "super-market"-type store, and listing dozens of businesses which were either damaged or looted.
My question is: What is known about the extent to which the actual protests devolved into, or involved, looting? Let's say - how many looted establishments x days? How many towns/localities x days in which looting by the protesters occurred? And how high is the fraction of that last figure out of the localities x days of protest overall?
My motivation for the question is trying to form a view of whether the looting has been a marginal phenomenon or a major one.
Note: This question was closed with the claim that it isn't about political processes. I emphatically reject that claim - the protests are a political process themselves, they are the results of political processes and actions (e.g. w.r.t. organization, deployment, training and arming of police forces), and has wide ramifications of political processes, both electoral and otherwise.

A:

It may take time before someone really studies this and comes up with meaningful numbers, especially on the national level.
One helpful way of approaching the question would be through insurance claims. According to The Real Deal, as of early June:

Verisk Analytics subsidiary Property Claim Services declared the civil disorder in Minneapolis to be a “catastrophe” — implying at least $25 million insured losses — and had extended that designation to over 20 states a few days later.

That implies a minimum of at least $500 million in property damage, which is significant but not off the charts. To give a point of comparison:

The most damaging civil disturbance on record was the 1992 Los Angeles riots, which led to $775 million in insured losses at the time, or $1.4 billion adjusted for inflation.

The other kinds of data you are asking for will probably be harder to compile because it is tracked by individual local police departments. Here is an article that looks at Chicago police reports and tries to interpret the impacts of looting, and you can see that it's a messy process.

Early information from the Chicago Police Department shows 116 burglaries on May 30 and 31 have been reported in the CPD districts that protect the downtown area.

By comparison, the two previous weekends combined saw just one burglary in the same districts.

[...]

In addition to the burglaries, another 89 criminal damage reports have been filed in the downtown police districts for May 30 and 31, according to CPD data. The same districts received a total of 10 criminal damage reports during the two previous weekends combined.

