HI,
If you can, get the latin name of the berry. It may be on the package, if you still have it. Common names can often be misleading. You may be able to get more precise information on the ripening once we have the correct name.
Tonight may be our hard frost, so you can test them today and tomorrow to see if there is any difference. I am betting there won't be a substantial difference between today and tomorrow, but please try and advise!
Recently, I read
Fading Feasts by Ray Sokolov. In one of his short articles, he was discussing the native persimmon, which was also reported to ripen fully after a frost. He found that information to be a lot of bunk. It may have a long ripening period, which may or may not coincide with a frost. In his experiment, he picked some native persimmons and put them in a closed paper bag. After a few days, long before a frost, they were ripe.
The reason we may have this 'ripe after frost' information is due to minimal availability of these fruits. They are so marginally available, they are not studied to learn the ripening period. So if someone provides anecdotal information, then it gets recorded as fact.