We have added a new feature to the search tool in phpBB, the ability to search for a post by its internal ID number. (That number is displayed on each post as a result of a mod made a few weeks ago.)
To search for a post by number (for example, if someone asks you to look at post 12345), enter a pound sign (#) and the post number into the Keywords field on the search form.
It works best when you also change the ‘display results’ mode to display by post rather than by topic.
Please report any problems with this new feature to the sysadmin.