With the increase in players, comes the need for some server database maintenance. Starting October 1, 2016 tents and stashes are considered abandoned if they have not been updated (touched) in over 90 days. On the old server it was 60 days, so I think this is more than generous.
As I write this rule, there are 84 objects that fall into this category.
I will not be removing players, so you can come back whenever and still have everything on your character.