Thank you very much Justin and Matthias for your replies!!
Our equipment list in mentioned here: Victron Solar System - Configuration, Fire Protection, and Monitoring
Unfortunately, we’re not using a Victron-authorized company — somehow it wasn’t easy to find the list with Victron-authorized sellers for our area. We had previously spoken with this seller about non-solar-related work, like replacing a gas water heater, and he mentioned he might provide a used unit for free if another client was replacing theirs soon. Not sure if he can do the same with our solar equipment and charge us for it and none would know.
It seems reasonable to check all equipment if it’s simple and possible, especially as there are major risks for us if not done well + we don’t know much about this seller + is not vetted by Victron. But apparently this isn’t possible to check with Victron. I’m curious why, as permitting such checks could better protect clients and also be helpful for warranty purposes.