The minecraft server now supports Private chests. Simply place a sign beside a chest/full chest and type [Private] in the first line. The second line will default to your name making you the owner. The following two lines can be used for other players you want to share your chest with.

Example sign:
[Private]
cbarber
TapOutU
luciferwife1

This sign would be owned by me, and shared with Noggin and luci.

You can add additional signs beside the chest using [More Users] in the first line.

Repost to public section.

Thanks for the helpful information