A couple of things to be aware of..
- Often station flying clubs will operate on the MATZ frequency out of hours.
- Military stations can re-activate flying operations with no notice.
- You may not be the only aircraft in or near the MATZ.
For that reason I'd recommend always staying on the published MATZ frequency during the transit, and make the occasional traffic call (entering, overhead, leaving) as a courtesy to other traffic, and also so that you'll know if the station below you has suddenly started operating again (particularly if you're in the overhead, they may not see you themselves).
G