In Dirtblock and in Skyblock my old usernames have claimed those chests, so I can't get to them, I was planning on just changing my username back to those but er.. yeah. (I changed my username when I was hangin out with some other friends and they thought it was a cool idea to do Elliesaurus and I agreed so yesh that happened and I did so without thinking about how it would effect Sandlot.. heh.)
Ask a moderator in game to completely remove the protections on the chests, then you yourself use /cprotect on them. This will not only add you to the chest protection, but also "fix" the chests so that if you change your name in the future, you will still be the owner. The reason it doesn't work right now is because the chests are protected via your name. When a moderator removes the protection and you /cprotect, it then protects with your UUID, so that name changes still give you access. Hopefully that made sense.
Yeah, nicknames do mess these things up. I will recommend asking a moderator to somehow fix this or somehow get you access to the chests so you can fix this, like these other posts have been saying. Moderators will help you with this stuff.
