The list of properties with insufficiently identified owner is published here.

In case you find your name on the list, please contact the office directly at podatelna@uzsvm.cz. Please attach to your request the closest possible specification of the property and, if applicable, the person who owns it.
You can also contact the office if you have any questions about under-identified owners.

It is necessary to step forward before the end of the year 2023.  Afterwards the under-idenfied properties will become state owned.

The Consulate General does not provide any further information.