In fact, any system provides only the possibility of anonymity. If the client himself is wrong or behaving incorrectly, deannonization is possible.
For example? Can you give examples?
For example, a client for a meeting with a girl takes his personal documents and mistakenly leaves them with her.
By the way, how do you even imagine this? It seems to me that it is impossible to lose documents in an unfamiliar place at all.