The food sitting out seems to be several days old at your best estimate.  Within the footlockers is primarily spare sets of clothing and fairly mundane daily odds and ends- things such as mess kits, books, fishing tackle, soap, mirrors, or shaving kits.  Also, there as various minor mementos that seem of little worth.  Among these, there is a small wooden holy symbol, a small scrap of parchment with a faded emblem on it, a glass vial filled with nail clippings, a tiny silver bell with a ribbon attached, crudely sketched blueprints to what appears to be a tavern, a deck of cards signed in flowing script, and a sheaf of paper bearing hand-written poetry so terrible it could potentially be used as a means of psychological torture.

Theren sees nothing new beyond what Tortetarte and Marcon have already seen.  As for an explanation of what might have happened?  Well, any conclusions he might have drawn from smashed buildings and large boulders strewn about the town are about all he has to go off of still.