Delete based on "Last Opened" not working

[maiasaura]

Hazel was exciting during the trial, but now somewhat disappointing since rules that *should* work don't. Here is a case:

I download dmg to my Downloads folder.
Once I open the DMG files and install the application, I'd like Hazel to delete it.
OK, not right away, but say a few hours after I've opened it.

Here are my rules:
Looks straightforward.
Now here is a .dmg file in my Downloads folder that was opened within the last 4 hours.


Why doesn't my Hazel rule now delete this file?

[Mr_Noodle]

Is it matching in preview? Also, what is the date last opened when you select the file and do Get Info on it? The issue here is that I believe sometimes that detail view lies about some dates. IIRC, the last opened date may actually be blank and that detail view will use the last modified date.

Another possible issue is if the disk image is still open. It is considered busy in this case and Hazel will not process it until you unmount it.