Stop the strategy, don't close trades, start it again and check the log for the "resumed".
Verify with your open positions.

{USD/CAD:VO:s51106} - resumed (3 lots)


But I agree, it would be nice to have some helper script, that may be fed with the .trd files and reports all open trades not found within the given .trd files.
Too bad I wouldn't know how to write that quickly.


Details about Log messages:

https://zorro-trader.com/manual/en/log.htm