The vault holds data that is obfuscated based on the original name, when the network does a get on your vault with the original name it goes through a decryption process to establish if you have the original content.
If you are talking about public data only then you could go to some lengths and try and work out if you have a chunk, not easy but possible, not for private data though. If it is public data then there is much less to worry about I would imagine. Its private data I am much more concerned about staying private. Public data by default would be identifiable at some stage, so should not be a surprise, the issue is do you know you are storing it, well no you don’t unless you go to lengths beyond what a normal user would do.
privacy of public data is a whole other subject 