Licence checker fails with free promotion apk (or maybe family library)?

[drmrbrewer]

I have a user that appears to have a genuine installation, but the licence checker is failing. It turns out that the user installed the app (a paid-for version) from a free promotion. Would this make any difference to the licence check to cause it to fail? When a user installs from a free version there is no record of the "purchase" in the Order Management part of Play Console, so no order number as such? How is this treated by PiracyChecker?

What about apps installed via the Family Library? Are these treated as correctly licensed by PiracyChecker?