Through my story you will understand the need for inbox searching:
A buyer asked me to check something, which took me about 8 days to check and test.
The problem is, I forgot to note to myself the username of this buyer, probably thinking at the time that I will remember who asked me and how to get back with him.
Then, after 8 days I realized I do not remember his/her nickname, so I started to sift through all of my conversations from the past 2 weeks, but I still couldn’t find it, so either I missed it among the thousands of words and sentences, or somehow the seller has vanished in the move to the New Inbox and the conversation is not recorded.
It is too bad there is no way to search through all of my conversations.
We can only search by username, but it is not so useful as searching for a specific phrase or word in the whole inbox.
So, this is the next developing challenge for fiverr development staff, please let us search inside inbox conversations.