Hi Erwin,
When you say the first 3 messages, are you referring to the first three posts of the archive?
If so, you can add 3 query loop blocks in the block element - hook.
For the 2nd query loop block, set the offset parameter to 1.
For the 3rd query loop block, set the offset parameter to 2.
For all the 3 query loop blocks, set the posts per page to 1.
Then you will need to add custom PHP code to offset 3 posts from the default original post loop.