I’ve been playing for a few years at this point, and getting a Blemmigan Secretary is literally one of the only goals I have left to complete before I end my character through SMEN. About a year ago I decided to start tracking results for each and every Surprise Package I got, just to have an idea of the results, etc.
Here’s a snapshot, even though probably nobody’s too interested: Imgur: The magic of the Internet
Again, sorry if it’s hard to read/understand, since it was made just for personal use. The chart on the bottom and the corresponding "Something…" info on the right is just percentages of where the resulting Echoes came from, overall.