Jacob Johst Christensen

I was testing the use of placeholders used in messages from Messaging triggers and found that standard placeholders don't work here. 
When I try the messaging-specific placeholders, however, I also find they don't work for me (see below). 

What is the trick here?

I was looking to reveal the ticket ID for the requester, and found there is no such placeholder. Is this coming?

Thank you!

Hi Mary O'Neill

I'd like to be part of this beta using my sandbox account, thanks!

Beyond the time and inaction conditions you mention are there other things like tags that can be used to select the tickets to be deleted?